CTI 2500-RIO-B Installation and Operation Guide V1.4
10
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
Analog/Word Module
Zero/Hold Selection
Analog/Word Output
State
Off
Zero
Zero*
Off
Hold Last Value
Last Value
Off
No selection
Last Value
Freeze
Zero
Last Value
Freeze
Hold Last Value
Last Value
Freeze
No selection
Last Value
*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.
WARNING:
If the RBC fails or loses power during system operation, all outputs will turn OFF(0) regardless
of the Freeze Jumper setting. This could result in damage to equipment and/or serious injury
to personnel.
2.5. Physical Installation
To insert the module into the I/O base, hold the top and bottom of the bezel and slide the module
carefully into the slot, pushing it all the way into the base. If you have inserted the module correctly,
you will feel a slight increase in resistance as the module mates with the base backplane connector.
Once the module is fully seated in the slot, tighten the captive screws at the top and bottom to hold
the module in place. To remove the module from the I/O base, loosen the captive screws, and then
pull the module from the base. Take care not to damage the connector at the back of the module
when inserting or removing the module.
2.6. Connecting to the RS232 Port
The RS232 port is provided to interface to PLC programming and configuration tools such as
TISOFT
TM
. The use of this port is optional. A standard 9-pin PC RS232 serial cable can be used to
connect to the programming device or modem. The port details are shown in
Figure 3.
Note that
the serial port on the standby unit in a redundant RBC pair is inoperative. This is normal –
the CPU makes no attempt to communicate with the serial port of the standby RBC. The
standby unit is the one displaying a “C” on the front panel LED display.
