Rockwell Automation MPP Processor Moduile - Manual (Page 20)

20 MPP October 2005 – Issue 6
Triguard SC300E
SERVICING
SCOPE
The MPP is not field-repairable. Field servicing operations are confined to the routine
replacement of SRAM backup batteries, and the total replacement of faulty MPPs. Spare keys
are available.
Faulty MPPs should be returned for repair.
Before a spare MPP is fitted, ensure that both the positions of the links and the types of pre-
programmed device are identical to those on the MPP that is being replaced.
While MPPs are out of the chassis it is good practice always to leave the front panel
keyswitch in the RESET position.
CAUTION 1
Do not attempt to repair a fault by replacing blown fuses F1 or F2. The fault that caused the
fuse(s) to fail will remain.
CAUTION 2
Spare MPPs should normally contain a full complement of pre-programmed devices. Should it
be necessary to transfer pre-programmed devices (EPROMs only) from a faulty MPP to a good
one, use the normal handling procedures for electrostatically sensitive devices and take
extreme care not to bend the IC pins.
DIAGNOSIS
A faulty MPP will be apparent by the abnormal state of its front panel LEDs. This may be
accompanied by audible alarms etc.
Note that in normal operation, the On Line, Run and Health LEDs will be on and the Test LED
will flicker at a rate determined by the preset ladder scan rate.
CONFIGURATION
Configuration is via links on the board.
Module Link settings
Link settings are given in Table 3-1