Main Processor Module 39
Chapter 3 System Description
Logic Power Connections
The MP Baseplate provides redundant, fused logic power connectors for the MP
and I⁄O modules, which are directly connected to the MP Baseplate.
Main Processor Alarm Connections
Alarms are asserted when the controller detects either a system alarm or a program
alarm. Each MP contains a set of redundant alarm solid-state relays. The relays are
normally closed and are connected in series between MPs.
A system alarm indicates a fault in the controller, its power supplies, or field input.
A program alarm indicates a problem detected by the control application. For more
information on program alarms, see the TriStation 1131 Developer’s Guide.
Feature Specification
Logic power 125 W, maximum
Fuse 8 A, slow-acting
Blown fuse indicator 20 mA
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