Allen Bradley 1785-LT3  Processor Module

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Product reference      1785-LT3

Classic PLC5 Family Processor Features From the family of PLC-5 processors, you can choose the processor(s) that you need for your application. Features common to all Classic PLC-5 processors are: same physical dimensions use of the left-most slot in the 1771 I/O chassis can use any 1771 I/O module in the processor-resident local I/O chassis with up to 32 points per module same programming software and programming terminals same base set of instructions ladder programs and SFCs can be used by any of the PLC-5 processors Check with your Allen-Bradley sales office or distributor if you have questions regarding any of the features of your PLC-5 processor. Subprogram Calls Use a subroutine to store 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 processor to go to a separate subroutine file within the logic processor, scan that subroutine file once, and return to the point of departure. For detailed information about how you generate and use subroutines, see your programming software documentation set. Sequential Function Charts Use SFCs as a sequence-control language to control and display the state of a control process. Instead of one long ladder program for your application, divide the logic into steps and transitions. A step corresponds to a control task; a transition corresponds to a condition that must occur before the programmable controller can perform the next control task. The display of these steps and transitions lets you see what state the machine process is in at a given time. For detailed information about how you generate and use SFCs, see you programming software. Ladder Logic Programs A main program file can be an SFC file numbered 1-999; it can also be a ladder-logic file program numbered 2-999 in any program file.

Backup System The following diagram shows a typical PLC-5 backup system:

In a PLC-5 backup system configuration, one system controls the operation of remote I/O and DH+ communications. This system is referred to as the “primary system.” The other system is ready to take control of the remote I/O and DH+ communications in the event of a fault in the primary system. This is referred to as the “secondary system.” See chapter 2, “Choosing Hardware,” to select backup system hardware. See the PLC-5 Backup Communication Module User Manual, publication 1785-6.5.4, for more information on configuring a PLC-5 backup system.

Use scanner mode whenever you want a Classic PLC-5 processor to scan and control remote I/O link(s). The scanner-mode processor also acts as a supervisory processor for other processors that are in adapter mode. The scanner-mode processor scans the processor memory file to read inputs and control outputs. The scanner-mode processor transfers discrete-transfer data and block-transfer data to/from the processor-resident local rack as well as to/from modules in remote I/O racks. A PLC-5 processor scans processor-resident local I/O synchronously to the program scan. A PLC-5 processor scans remote I/O asynchronously to the program scan, but the processor updates the input/output image data table from the remote I/O buffer(s) synchronously to the program scan. This occurs at the end of each program scan.

The scanner-mode PLC-5 processor can also: 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 Configure the PLC-5/15 or -5/25 processor for scanner mode by setting switch assembly SW1.

Use a Classic PLC-5 processor (except the PLC-5/10 processor) in adapter mode when you need predictable, real-time exchange of data between a distributed control PLC-5 processor and a supervisory processor. You connect the processors via the remote I/O link (see Figure 1.3). You can monitor status between the supervisory processor and the adapter-mode PLC-5 processor at a consistent rate (i.e., the transmission rate of the remote I/O link is unaffected by programming terminals and other non-control-related communications). 

1 The following programmable controllers can operate as supervisory processors: PLC2/20
and PLC2/30
processors PLC3
and PLC3/10
processors PLC5/11, 5/15, 5/20, 5/25, and 5/30 processors as well as PLC5/VME
processors PLC5/40, 5/40L, 5/60, 5/60L, and 5/80 processors as well as PLC5/40BV
and PLC5/40LV
processors PLC5/20E
, 5/40E
PLC5/250
All PLC5 family processors, except the PLC5/10, can operate as remote I/O adapter modules. 2 2 The PLC-5 processor in adapter mode acts as a remote station to the supervisory processor. The adapter-mode PLC-5 processor can monitor and control its processor-resident local I/O while communicating with the supervisory processor via a remote I/O link. The supervisory processor communicates with the PLC-5/12, -5/15, or -5/25 adapter with either eight or four I/O image table words. A PLC-5 processor transfers I/O data and status data using discrete transfers and block transfers. You can also use block-transfer instructions to communicate information between a supervisory processor and an adapter-mode processor. The maximum capacity per block transfer is 64 words.

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