Rockwell Automation 1785 PLC-5 User Manual download pdf (Page 29)

Installing Your PLC-5 Backup System

Chapter 3

3-6

Keying Your I/O Chassis

Use the plastic keying bands, shipped with each I/O chassis, to key the

chassis slot to accept only the 1785-BCM module.

The module circuit board is slotted in two places on the rear edge. The

position of the keying bands on the backplane connector must correspond

to these slots to allow insertion of the module. You can key any connector

in an I/O chassis to receive this module except for the left-most connector

reserved for the processor modules.

Place keying bands between the following numbers labeled on the

backplane connector (Figure 3.2):

Between 8 and 10

Between 34 and 36

Figure 3.2

Keying

Positions

Keying bands

Backplane Connectors

11052I

Setting the 1785-BCM Series B Switch Assemblies

The switch assembly SW1, located at the top of the 1785-BCM module,

has four switches as shown in Figure 3.3. Refer to Table 3.E for

instructions on setting the four switches. The functions of the four switches

are:

Switch 1 indicates to the 1785-BCM series B module whether the other

1785-BCM module is a series A or a series B module. If it is a series A

module, functions of switches 2 through 4 will not apply.

Switch 2 selects the Fast Data-Transfer mode from the secondary

module to the secondary processor (1785-BCM series B module only).

Switch 3 is not used.

Switch 4 is not used.

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Rockwell Automation 1785 PLC-5 User Manual Page 29