Rockwell Automation 1785 PLC-5 User Manual download pdf (Page 149)

Reference Information

Appendix B

B-2

Q. In which slot of the local I/O chassis do I install the 1785-BEM

module?

A. We recommend that you install the 1785-BEM module in the

right-most slot of the first I/O module group in the I/O chassis for ease

in making connections and programming. Note that the 1785-BEM

module must be in the same I/O group as the 1785-BCM module.

(Refer to Chapter 3 and Chapter 4 for more information.)

Q. Does the 1785-BEM module have to go next to the 1785-BCM

module?

A. Yes. They should be placed in the same I/O module group.

Q. How do I set the local I/O chassis backplane switches for a PLC-5

backup system?

A. Set the switches as shown in the following table. (Refer to Chapter 3

for more information.)

Set switch(es) To this position:

1 OFF – to turn off outputs in the chassis when a fault is detected.

2 and 3 both OFF – these switches are not used

4 and 5

4 – ON

configure for 1/2-slot addressing*

5 – OFF configure for 1/2-slot addressing*

6 and 7 as required for your application

8 as required for your application

The 1785-BCM module appears to the PLC-5 processor as a 32-point input module. You must

configure switches 4 and 5 for 1/2-slot addressing or 1-slot addressing. If not configured as 1/2-

or 1-slot addressing, a PLC-5 processor fault will occur. If you are installing a 1785-BEM

module, you must select 1/2-slot addressing.

Q. How do I set the remote I/O chassis backplane switches for a

PLC-5 backup system?

A. The operation of the PLC-5 backup system is independent of the

operation of the remote I/O chassis; therefore, you can set these

switches as required for your application. For more information about

setting the I/O chassis switches, refer to the PLC-5 Enhanced and

Ethernet Programmable Controllers User Manual (publication

1785-6.5.12).

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Rockwell Automation 1785 PLC-5 User Manual Page 149