Allen Bradley 1785-LT/B FW:R PLC-5/15 Processor Module With satisfying service

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Product reference      1785-LT/B

The Allen-Bradley 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.

The scanner-mode PLC-5 controller can:- gather data from node adapter devices in remote I/O racks - process I/O data from 8-, 16-, or 32-point I/O modules- address I/O in 2-, 1-, or 1/2-slot I/O groups- support a complementary I/O configuration - support block-transfer in any I/O chassis - ladder logic program using a language that is representative of relay logic.- performing diagnostics- programming discrete control

Use the 1785 for subroutines for storing recurring sections of program logic that can be accessed from multiple program files. A subroutine saves memory because you program repetitive logic only once. The JSR instruction directs the controller to go to a separate subroutine file within the logic controller, scan that subroutine file once, and return to the point of departure.

Main Control Programs (MCPs)
Separate sequential logic from ladder logic and structured text as a way of modularized your process and making troubleshooting easier. Use several main control programs (MCPs) to define one main control program for each particular machine or function of your process. MCPs accommodate independent or non-sequential activities.

Some terms used in this manual may be unfamiliar to you. We list these terms with a brief definition of each. HSSL is the 1785-BCM module’s High-Speed Serial Link. It is a dedicated communication link between the primary and secondary 1785-BCM modules and is used to pass I/O, status, and data table information. Primary System is the PLC-5 processor that controls the I/O and the other equipment associated with that processor. Secondary System is the PLC-5 processor that is ready to assume control of the I/O and the equipment associated with that processor. Backup System is the primary and secondary systems.

Switchover is the transfer of I/O control from the primary processor to the secondary processor. Bumpless switchover is the transfer of I/O control from the primary processor to the secondary processor where the operation of the process being controlled is not affected. Asynchronous processing is processing where the ladder program scan and the block-transfer scan operate independently of each other within the same scan time. BTW is block-transfer write; transfer of up to 64 words from the processor to the block-transfer module. BTR is block transfer read; transfer of up to 64 words from the block transfer module to the processor. Smart Switch Interface is a remote I/O interface in the 1785-BCM module that responds to secondary scanner poll commands with actual input values from the remote I/O link, making the scanner think it is talking with remote I/O.

How the PLC-5 Backup System Works In the PLC-5 backup configuration, one system (consisting of one PLC-5 processor, 1785-BCM module, power supply, and chassis) controls the operation of the remote I/O. This system is referred to as the primary system. The other system is ready to take control of the remote I/O in the event of a fault in the primary system. This is referred to as the secondary system. The PLC-5 backup system does not back up local I/O; therefore, do not install I/O in the local chassis. Data Transfer During normal operation, the primary system sends remote input and data table data to the secondary system so that in the event of a switchover, the secondary system (which becomes the new primary system) has the same data. Remote I/O data is automatically transferred over the High-Speed Serial Link (see Figure 1.1). This transfer is independent of the application program. Data table values are transferred from the primary to the secondary system with block transfer instructions that you include in your ladder program. You do not have to transfer data table values if not necessary for your application. Figure 1.3 shows how data table data is transferred from the primary to the secondary system.

Switchover Should a fault occur in the primary processor, control switches to the secondary system in less than 50 ms (maximum). When a switchover occurs, the outputs in the remote I/O maintain their last state until they come under the control of the secondary processor. However, keep in mind that the program scans of the two processors are not synchronized. This means that the secondary processor may be scanning all, none, or only part of the program (at your discretion). This manual explains the switchover process, and provides guidelines for developing programs for your PLC-5 backup system. (For more information about switchover, refer to Chapter 6, “Switchover Considerations.”) Role of the 1785-BCM Series B Module As an integral part of the backup system, the 1785-BCM modules enable high speed communication between the two PLC-5 processors, and permit the secondary processor to assume control of the process. In addition, the 1785-BCM module provides: high speed transfer of the data table values from the primary to the secondary system, to ensure that the secondary system’s data table is a copy of the primary system’s a buffer of 4K words for data table values exchange of information on the status of the primary and secondary systems automatic transfer to the secondary system of the remote input and block transfer read values (analog values, etc.) transfer of control from the primary processor to the secondary processor when one of the following conditions occur: - power failure - processor fault - 1785-BCM module fault - change in the primary processor’s mode from: RUN to PROGRAM (manual switchover) REM RUN to REM PROG REM RUN to REM TEST

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