Setting The Output State On Communications Loss; Setting Software Parameters In Workshop Or Com Profibus - Control Technology 2500 Series Installation And Operation Manual

Setting the Output State on Communications Loss

When I/O channel communication to a remote base is lost, the state of the discrete outputs is
determined by the selection made on the 2500-RBC jumper JP1 (Off/Freeze). Figure 2 shows the
location of the jumper on the 2500-RBC.
The 2500-RBC ships with the FREEZE jumper in the OFF setting.
If the jumper JP1 is missing from the board, the 2500-RBC defaults to the OFF setting.
For discrete output modules, the state of the outputs is determined solely by the position of the
Off/Freeze jumper JP1 on the 2500-RBC.
For analog/word output modules, the state of the outputs is influenced not only by the position of the
Off/Freeze jumper but by the output module's (Zero/Hold Last Value) selection, if the module has
that option. See the table below.
RBC Off/Freeze
Selection
Off
Off
Off
Freeze
Freeze
Freeze
*see the user manual of your analog/word output module for details
Notice that the Freeze option on the RBC overrides the Zero selection on the analog/word output
module; likewise, when Hold Last Value is selected on the analog/word output module, that selection
overrides the "Off" option on the RBC jumper.

Setting Software Parameters in WorkShop or Com Profibus

The 2500-RBC has parameters that are specified using the Com Profibus configuration utility
software. Refer to the Chapter 3 for information about using Com Profibus. The paragraphs below
describe the parameters used to set up the 2500-RBC.
CTI 2500-RBC Installation and Operation Guide V1.6
NOTE:
NOTE:
Analog/Word Module
Zero/Hold Selection
Zero
Hold Last Value
No selection
Zero
Hold Last Value
No selection
Analog/Word Output
State
Zero*
Last Value
Last Value
Last Value
Last Value
Last Value
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