Rockwell Automation 1400 User Manual

ALLEN-BRADLEY

A–B

Bulletin 1400
Power Monitoring Products

Bulletin 1400-DCU/BCU Communications Card

Instruction Sheet

Description

Field Retrofit and Configuration of the Communications Card

Bulletin 1400–DCU

The Bulletin 1400-DCU/BCU Communications Card supports Remote I/O
and can be optionally configured as either RS-485 or RS-232C. Remote I/O
and one of the two open architectures are active at all times. RS-232C or
RS-485 are selected by means of a jumper.

Note: Bulletin 1400–DCU is used with the Powermonitor Display Module
and Bulletin 1400–BCU is used with the Powermonitor Block Module.

This section explains the procedure for installing a universal communications
card or changing the communications mode.

The card has a jumper block to allow the user to select RS-232C or RS-485
mode. The card’s currently selected communications mode may be viewed
from the front panel of the Powermonitor Display Module, if the unit is
operating, (see Publication 1400-5.2, Chapter 3, “Field Programming”), or
by removing the card and examining the position of the jumper block.

Bulletin 1400–BCU

Instruction Sheet

B

Bulletin 1400
Power Monitoring Products

Removing An Existing Card

ATTENTION: An anti–static wrist grounding strap must be
worn at all times while performing any reconfigurations or

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modifications to the Powermonitor Display/Block Module.
Failing to do so may permanently damage the static–sensitive
components inside the Powermonitor Display/Block Module.

1. Turn off all power to the Powermonitor Display/Block Module.

ATTENTION: Voltages may still be present when supply power
is turned off to the unit. The unit will generally be powered by

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one source and will be monitoring another source. Turn off or
disconnect all voltages applied to the unit. Failure to do so may
result in personal injury or death.

Configuring the Display Communications Card

Configuring the

lock

Communications Card

2. Remove the four machine screws holding the rectangular communications
card mounting plate on back of the Powermonitor Display/Block Module.
case.

3. Carefully pull the plate away from the main chassis using the pull tabs to
remove the card.

The circuit board of the communications card has a jumper labelled Jl. This
jumper has two positions, which determine the communications mode.
Figure 1 illustrates the jumper in the bottom position for RS-485 mode. If
the RS-232C mode is desired, move the jumper into the top position.

Figure 1
Communications Card Jumper Configuration

RS–232C Mode
(T op Position)

The Powermonitor Block Communications card has a jumper labelled J1.
This jumper has two positions, which determine the communications mode.
The jumper is configured for RS–485 mode from the factory. If RS–232C
mode is desired, move the jumper over the two pins closest to the LEDs.

RS–485 Mode
(Bottom Position)

Remote I/O Addressing

The Powermonitor Block Communications card uses two DIP switches to
configure the RIO address, starting quarter, data rate, and last rack. The DIP

2

switches are shown in the default factory configuration.