Plc 5 Slot Numbering

1. Plc 5 Slot Numbering Software
2. Plc 5 Rack Slot Numbering
3. Plc 5 Slot Addressing
4. Plc Slot Numbering
5. Plc 5 1 Slot Addressing
6. Plc 5 Slot Numbering Machine

• When including a PLC in the ladder diagram still remains. But, it does tend to become more complex. Figure 5 below shows a schematic diagram for a PLC based motor control system, similar to the previous motor control example. This figure shows the E-stop wired to cutoff power to all of the devices in the circuit, including the PLC.
• The brain of the whole PLC is the CPU module. This module typically lives in the slot beside the power supply. Manufacturers offer different types of CPUs based on the complexity needed for the system. The CPU consists of a microprocessor, memory chip and other integrated circuits to control logic, monitoring and communications.
• The PLC-5 ® processors are single-slot modules that are placed into the left-most slot of a 1771 I/O chassis. They are available in a range of I/O, memory, and communication capability. PLC-5 processors have ports configurable for either a Data Highway Plus messaging communication link or a Universal Remote I/O link.
• LDF Load Formatted 5–60 LDR Load Real Number 5–64 LDX Load Indexed 5–62 LDLBL Load Label 5–145 LDSX Load Indexed from Constant 5–63 MDRMD Masked Drum Event Discrete 6–19 MDRMW Masked Drum Event Word 6–21 MLR Master Line Reset 5–185 MLS Master Line Set 5–185 MOV Move 5–144 MOVMC Move Memory Cartridge 5–145.

The PLC-5® processor module in a 1771 platform provides a proven approach for industrial control. PLC-5 processors are high-speed, single-slot processors used for control and information processing. They are designed for larger sequential and regulatory control applications with specialized I/O requirements and/or the need to coordinate with other processors and devices.

PLC-5 processors are available in a range of I/O capacity and memory size, and can be connected in a variety of networks for distributed processing and distributed I/O. The 1771 I/O products offer a full range of digital and analog I/O (including intelligent I/O) in a rugged modular assembly.

Benefits

• Modularity — Modular I/O and communication interfaces provide a configurable and expandable system. A system should be configured for the required number of I/O and the communication networks. Later, when system expansion is necessary, I/O or communication interfaces can be added.

• Speed — Fast delivery of messages between networks, between links within networks, and between modules across the backplane.

Publication 1785-SG001B-EN-P - June 2006 2 Introduction PLC-5 System Overview A PLC-5/1771 control system, at minimum, consists of a programmable controller and I/O modules in a single 1771 chassis with a power supply.

• Toughness — Industrially-hardened hardware platform is designed to withstand the vibrations, thermal extremes, and electrical noise associated with harsh industrial environments.

• Broad I/O options — A large selection of 1771 I/O modules available for use in the local I/O chassis, and an even larger selection of I/O available at locations remote from the processor, can be connected across ControlNet™, DeviceNet™, and Remote I/O links.

Communication

A PLC-5 processor communicates across the 1771 backplane to 1771 I/O modules in the chassis in which the processor resides. The different models of PLC-5 processors have various on-board ports for communication with other processors, computers, and remotely located I/O. Also, separate modules are available to provide additional communication ports.

Each PLC-5 processor has a built-in RS-232/422/423 communication port. Each PLC-5 processor also has one or more on-board ports that can be configured for either Data Highway Plus (DH+) or Universal Remote I/O. As a Universal Remote I/O port, it can be configured as either an I/O scanner port or an I/O adapter port. Selected models of PLC-5 processors have on-board ports for Ethernet, ControlNet, or Extended Local I/O communication.

In addition to the on-board ports available with PLC-5 processors, adding another communication port for a PLC-5 processor is as simple as adding an optional communication module.

I/O adapter modules for 1771 I/O are available for ControlNet, Universal Remote I/O, and Extended Local I/O links. An I/O adapter module in a chassis with I/O modules interfaces the I/O modules with the I/O link for communication with a scanner port of a processor at another location.

System Components

A PLC-5 / 1771 control system at minimum consists of a processor module and I/O modules in a single 1771 chassis with a power supply. Choose the processor module with the on-board communication ports needed.

On-board Universal Remote I/O scanner ports are available on all PLC-5 processors. On-board Extended Local I/O scanner ports are available on some PLC-5 processors. On-board ControlNet ports are available on some PLC-5 processors. To provide a DeviceNet I/O scanner port to the system, a DeviceNet scanner module (1771-SDN) is necessary.

Typical Configurations

In this typical configuration, a ControlNet port on the processor module interfaces the processor to the ControlNet link. In each of the two chassis remote from the processor, a 1771-ACN15 I/O adapter module provides I/O modules in those chassis with an interface to the ControlNet link. The PLC-5 processor monitors/controls the I/O in its local I/O chassis as well as the I/O in the remote locations.

The 1771 power supply module plugs into an I/O module slot, or you can connect a stand-alone 1771 power supply to the left end of each chassis.

PLC-5 Processors Overview

The PLC-5^® processors are single-slot modules that are placed into the left-most slot of a 1771 I/O chassis. They are available in a range of I/O, memory, and communication capability.

PLC-5 processors have ports configurable for either a Data Highway Plus messaging communication link or a Universal Remote I/O link. As a Universal Remote I/O port, it can be configured as either an I/O scanner port or an I/O adapter port. As an I/O scanner port, it monitors and controls the I/O on the link by communicating with the I/O adapters for those I/O. As an adapter port, it communicates only with the I/O scanner port on the link, passing a maximum of one I/O rack of input and output data between the two to provide distributed processing.

All PLC-5 processors have Data Highway Plus and RS-232-C/422-A/423-A communication ports. In addition to these ports, each Ethernet PLC-5 processor has an Ethernet communication port, and each ControlNet PLC-5 processor has a ControlNet communication port.

Although each Ethernet PLC-5 processor has on-board Ethernet ports; additional Ethernet ports can be added to any PLC-5 processor system with a 1785-ENET Ethernet Interface Module. PLC-5 processors do not have an on-board DeviceNet port. A DeviceNet port can be added to the system with a 1771-SDN scanner module.

Benefits

• Ladder-logic and structured-text programming

• Advanced instruction set including file handling, sequencer, diagnostic, shift register, immediate I/O, and program control instructions

• Multiple main control programs for segregation of control tasks

• Processor input interrupts and global status flags

• Programmable fault response for reacting to a fault before the system goes down

• Timed interrupt routine for examining specific information at specific time intervals

• Protected memory selectable by word on selected processors

• 512 through 3072 maximum forcible I/O in any mix

• Up to 50,176 maximum non-forcible I/O

• Processor-resident local I/O (1771 I/O modules)

• Extended-local I/O on selected processors (1771 I/O modules)

• Universal Remote I/O (1746, 1771, and 1794 I/O modules and 1791 I/O blocks)

Plc 5 Slot Numbering Software

• DeviceNet I/O (1794 I/O modules, 1792D I/O blocks)

• ControlNet I/O on selected processors (1771, 1734, 1794, 1797 I/O modules)

• Universal Remote I/O ports can be configured as either an I/O scanner port or an I/O adapter port

Built-in Web Services

Ethernet PLC-5 processors (1785-L20E, -L40E, and -L80E), and the Ethernet interface module (1785-ENET) provide built-in web capabilities:

• Web Diagnostics and Module Information lets a standard web browser access information stored in the PLC-5 processor data table, including module diagnostic information (requires RSLogix5, version 5.2 or later).

• Web User Provided Pages allows for unique Web page creation to provide custom data table information. Any Internet user who has network access to the PLC-5 processor can view these pages, which can be either HTML pages that contain data table elements, text and images, or Custom Data Monitor pages that contain data table elements in table form.

• Domain Name Service (DNS) lets Internet users access the built-in Web server by a specified name instead of by IP address (requires RSLogix5, version 5.2 or later).

PLC-5 Processors with Protected Memory (1785-L26B, -L46B, L86B, -L46C15)

All enhanced PLC-5 processors have memory protection. However, those processors designated as having the memory protection feature have the added capability of limiting access to individual words.

Choose a PLC-5 processor with protected memory when access must be limited to critical or proprietary areas of programs, selectively guard processor memory and I/O words, or restrict use of processor operations.

The PLC-5 protected memory feature expands system validity and security beyond what is provided by the password-and-privilege capability of the other PLC-5 enhanced processors. Custom software protection schemes can be designed for each application.

Rockwell Software programming software can be used to assign class privileges to specific user accounts or a user job function, such as system administrator, plant engineer, maintenance engineer, or operator. Using four privilege classes and associated passwords, access can be limited to critical program areas and restrict access to:

• Communication channels

• Remote nodes attached to a DH+ or ControlNet network

• Program files

• Data files

• Individual data words

The PLC-5/26, PLC-5/46, and PLC-5/86 protected processors are equivalent to the PLC-5/20, PLC-5/40, and PLC-5/80 standard processors, respectively, plus the added memory protection feature. These processors are listed under the heading 'Standard PLC-5 Processors with Protected Memories' in the PLC-5 Processor selection tables.

The PLC-5/46C15 protected processor is equivalent to the PLC-5/40C15 ControlNet processor plus the added memory protection feature. This processor is listed under the heading 'ControlNet PLC-5 Processors with Protected Memories' in the PLC-5 Processor selection tables.

Before you can program any PLC system, you have to understand how the addressing is done in that particular PLC. Wrest point casino blue chip. I have included a actual screenshot from RSLogix 5000 below that shows examples of addressing in RSLogix 5000.

INSTRUCTION – RSLogix 5000's Relay Ladder Logic command language is comprised of 'instructions'. An XIC (it looks like a normally open contact –] [– ) is an instruction. A timer is an instruction. A few of the most common instructions are described below.

BIT – an address within the PLC. It can be an input, output or internal coil, among others.

RUNG – A section of the PLC ladder program that terminates in an output function of some type. Just like in an electrical ladder diagram, a rung has some type of output that is turned on or turned off by the preceding entities in the rung. The first rung in a ladder program is always 0.

HARDWIRED INPUT – a physical connection to the PLC from an input device (switch or sensor, etc.).

RSLogix 5000 defines the address of the input, based on the input cards that you configure.

We'll see how this works later on, but here is an example of a hardwired input:

Local:4:I.Data.3

Here is what each part of the address means:

Local:4:I.Data.3
'Local' means that the module is connected to a controller across a backplane or with a parallel link, keeping the module within a few inches of the controller.

Plc 5 Rack Slot Numbering

Local:4:I.Data.3
'4' means that the module is module 4 (located in the 5th slot in the rack).

Local:4:I.Data.3
'I' means the bit is an input

Local:4:I.Data.3
'Data' indicates the type of data (this is the default for I/O)

Local:4:I.Data.3
'3' indicates that the bit is 4th input on the card (the bits start with 0).

By the way, don't get the capital 'I's' confused with ones.

So, in evaluating our example, we would describe the bit as 'Module 4, bit 3'.

Here is where some confusion comes in. Because the Rockwell numbering system starts with 0, and the processor resides in Slot 0, our example bit is actually in slot 5. Our bit 3 is actually the 4th bit. We could also describe the bit as 'Slot 5, position 4'.

You will have to learn to transpose these ways of describing a bit back and forth in your head. If you are troubleshooting a problem, and you want someone to look for a signal on our example bit, you might have to tell him to look at the 4th position on the 5th slot. That will lead him to the physical point on the PLC.

However, you need to keep in mind that the corresponding bit in your program will be labeled Local:4:I.Data.3.

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It can be confusing, but you will get used to it.

HARDWIRED OUTPUT – a physical connection from the PLC to an output device (relay or pilot light, etc.)

Outputs are addressed the same way.

Local:5:O.Data.4
'Local' means that the module is connected to a controller across a backplane or with a parallel link, keeping the module within a few inches of the controller.

Local:5:O.Data.4
'5' means that the module is module 5 (located in the 6th slot in the rack).

Local:5:O.Data.4
'O' means the bit is an output

Local:5:O.Data.4
'Data' indicates the type of data (this is the default for I/O)

Local:5:O.Data.4
'4' indicates that the bit is 5th output on the card (the bits start with 0).

INTERNAL COIL
This is a programmable bit used to simulate a relay within the PLC. The internal coil has no connection to the outside world. It does not connect to an output card. Internal coils are used to store information. The 'contacts' of this 'relay' can then be used multiple times in other parts of the program.

RSLogix 5000 has greatly simplified the process of describing an internal coil. We can simply give it a name, known as a tag.

For example, if you have an internal coil that is the result of, say, three hardwired safety gate limit switches, we could label the coil 'SafetyGatesClosed'.
Note the lack of spaces in the tag name. RSLogix 5000 does not allow spaces, or other special characters, in the tag name.

Some people use underscores, so the tag might be 'Safety_Gates_Closed'. Either way is fine; it just depends on what your company or your client prefers.

TIMER
A timer is a programmable instruction that lets you turn on or turn off bits after a preset time.

The two primary types of timers are TON for 'timer on delay' and TOF for 'timer off delay'.

Timers in RSLogix 5000 use tag names for identification.

COUNTER
A counter is a programmable instruction that lets you turn on or turn off bits after a preset count has been reached.

There are different types of counters available in the RSLogix, but the CTU (counter up) instruction covers everything we will talk about here.

Counters in RSLogix 5000 use tag names for identification.

–] [– Normally Open Contact
When used with a hardwired input, this instruction is off until there is a voltage applied to the input. The bit address then goes high, or on, and the instruction becomes 'true.' It works the same way when it has the same address as an internal coil, except that the coil must be turned on by logic in the program.

Allen-Bradley calls these normally open contacts 'XIC', or 'eXamine If Closed' instruction.

An XIC instruction can reference a hardwired input, a hardwired output, an internal coil or a timer done bit, among others.

–]/[– Normally Closed Contact
This is an inverted normally open contact.

When used with a hardwired input, this instruction is 'true' until there is a voltage applied to the input. It then goes low, or off, and becomes 'false.'

It also can be used with an internal coil, becoming true when the coil is off and becoming false when the coil is on.

Allen-Bradley calls these normally closed contacts 'XIO', or 'eXamine If Open' instructions.

Plc 5 Slot Addressing

-( )- Output Coil
When used with a hardwired output, this function is off until the logic in the program allows it to turn on. It then becomes 'true', and will energize the device that is wired to the respective output.

Plc Slot Numbering

If it is used as an internal coil, it will toggle the instructions associated with it. That is, it will close a normally open instruction and open a normally closed instruction.

Allen-Bradley calls these outputs 'OTE', or 'OutpuT Energize'.

An OTE may be used with a hardwired output or an internal coil.

TRUE – A state that indicates an instruction is allowing logic to 'flow' through it.

Plc 5 1 Slot Addressing

Also, if the logic in a rung turns on the output of the rung, then the rung is said to be true.

FALSE – Without stating the obvious, this is the opposite of true.

Plc 5 Slot Numbering Machine

Excerpted from PLC Programming with RSLogix 5000