Replacing Modules 195
Chapter 5 Fault and Alarm Indicators
Replacing Modules
This section describes how to replace faulty MP, CM, and I⁄O modules. The I⁄O
instructions explain how to replace a module when it has a hot spare and when it
does not.
The following instructions are included:
• “Replacing a Main Processor Module” on page 196.
• “Replacing a Communication Module” on page 197.
• “Replacing an I⁄O Module Without a Hot Spare” on page 198.
• “Replacing an I⁄O Module With a Hot Spare” on page 199.
Guidelines for Replacing Modules
Before replacing any module, you should observe the following guidelines.
!
WARNING
If a controller has two faults, one in an MP and one in another type of module,
replace the MP first. Wait until the Active indicator of the replacement module
goes on, then replace the second faulty module.
•If an I⁄O module has a field fault and a module fault, resolve the field fault
first. Before replacing the I⁄O module, then reset the I⁄O module using the
TriStation Diagnostic Panel.
!
CAUTION
Before inserting any module into the controller, check for damaged pins. If
damaged pins are present, do not insert the module. Inserting modules with
damaged pins may cause the controller to malfunction and may affect the
controlled process. If you find a module with damaged pins, please return it to
Triconex for repair.
• When replacing a module, you must use a #2 flat-blade screwdriver to lock
or unlock the module. See “Installing Modules” on page 148.
• For optimal performance, store spare I⁄O modules in vacant slots as hot
spare/hot replacement modules.
• Store any remaining, unused modules in their original shipping cartons.
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