Plc 5 1/2 Slot Addressing

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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.

Front Panel 1-2 PLC-5/30, -5/40, -5/60,-5/80 Processor. 2 Maximum I/O possible using 16-pt modules with 2-slot addressing or 32-pt modules with 1-slot addressing. Here it uses Allen Bradley notation for PLC-5 racks. At the top is the location of the input card I:013 which indicates that the card is an Input card in rack 01 in slot 3. The PLC-5 and SLC-500 use a rack/slot/register/bit method for addressing the I/O modules. For example input point 15 in slot 2 of rack 1 would be addressed - I:1:2/15. The same goes for outputs. Now the legacy problems prop up. In the old days most things were octal so AB allows for different methods for addressing modules in the rack. SIMATIC S5 S5-115U Programmable Controller Manual CPU 941-7UB11 CPU 942-7UB11 CPU 943-7UB11 and CPU 943-7UB21 CPU 944-7UB11 and CPU 944-7UB21 EWA 4NEB 811 6130-02b.

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

Plc 5 1/2 Slot Addressing Machines

Benefits

  • Ladder-logic and structured-text programming
  • Advanced instruction set including file handling, sequencer, diagnostic, shift register, immediate I/O, and program control instructions
Plc 5 1/2 Slot Addressing
  • 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
Slot
  • 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)
  • 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:

Plc 5 1/2 Slot Addressing Tool

  • 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).
Addressing
  • 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

Plc 5 1/2 Slot Addressing System

  • 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.

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'Block transfer Write/read, PLC-5 (Ab)'

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Mike - (9 posts) Jan-22-02, 12:27 PM (EST)
'Block transfer Write/read, PLC-5 (Ab)'
Basically, I need to know what the specifics are of the BTW/BTR in a PLC-5. I am new to these functions, and need to appreciate the interpolation between the control bits BTxxxx and the remote I/O attached. I have tried unsuccessfully to get a decent explanation from Ab.com, and the programming help is of little use. If anybody can help me thanks v much.
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RE: Block transfer Write/read, PLC-..., Allen Nelson, Jan-22-02, (1)
RE: Block transfer Write/read, PLC-..., ianingram, Jan-23-02, (2)
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Allen Nelson - (187 posts) Jan-22-02, 01:49 PM (EST)
1. 'RE: Block transfer Write/read, PLC-5 (Ab)'

Because analog I/O has data than can just fit in a single 16-bit word, you need to have a special instruction to get the data into/out of the modules, instead of just being able to look at the data table (You probably knew that, but I'm writing for lurkers too - forgive me if I get too simplistic).

Those instructions are the Block Transfer Write (BTW) and Block Transfer Read (BTR). These instruction transfer a block of data (up to 64 words) from the PLC to a module (BTW) or from the module to the PLC (BTR).

In general, each (analog) I/O module needs a BTW/BTR pair, one for configuration, the other for data. If, for example, you have an analog input module, you would execute a BTW instruction on the powerup scan (or if data from the BTR indicated that the module had somehow lost it's configuration) to give it all the parameters that it needs to return data correctly (number of channels, format of data (2's complement, BCD), range for each channel (typically 0-4095, but some folks like to bring in the Input in engineering units))

Then, on all other scans, the BTR instruction will be executed to read all the channel data.

The BTR and BTW instruction need two blocks of register addresses in order to work: a control register, and a data register. The control register can be either a BT type (preferred), or an integer type (if you're dealing with older PLCs, or SLCs). The data register must be an integer type (although as I look at the Help file, I see an Input type shown in the example - I have no idea why they would do that!).

The control registers contains all the housekeeping info for making the instruction work - the status bits, the Rack/Slot/Group address (shown on the instruction), and other stuff that is frankly unimportant.

The data registers contain the data that is to be transferred in one block. If it's the BTW to that Analog input, it would contain the number of channels, format of data, etc. If its the BTR from the AI, it would contain some header info (typically about 5 words), followed by the current readings (scaled in the manner that you configured the module with the BTW).

Now for the easy part. In the bad old days, we had to set up the configuration by hand, making sure that all 22 words of data sent to configure an analog input were just right. RSLogix has made it easy with the IO CONFIGURATION, near the top of the project window on the left.

Double Click on IO CONFIGURATION. Double click on the Chassis Type (or right click and Add a Chassis). Configure your rack to the correct size. Point to the slot on the chassis where you will have a module, right click and select Add Module. Pick the part number. Once the part number is in the correct spot, right click and select Display Module (or just double click), and you will be presented with a dialog box for entering the Config and Data registers for both the BTW and BTRs. Enter them if you've already decided what they should be, or just pick Auto-pick (I've never been happy with the addresses they auto-assign, but that could just be me), and it will bring up a helpful window. This window allows you to just pick the setting that you want, and shows where the data will be located for programming. (If you were live with the PLC, it would show that actual raw data).

You can use the Insert Ladder Rungs button to have RSLogix make the proper ladder code for the BTW and BTR rungs. Play around with this screen and the settings and you'll get a good feel for what's going on in the BTR/BTW.

You can access this screen quickly by clicking on 'Setup Screen' on the BTR or BTW instruction.

Good luck, if you have any more specific questions, just ask,

Allen
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ianingram - (23 posts) Jan-23-02, 07:12 AM (EST)
2. 'RE: Block transfer Write/read, PLC-5 (Ab)'
try this link

(this link is mainly about analog inputs/outputs in general, but there is an example for a PLC-5 using BTW)

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