Rockwell Automation MDO32BNS 32-Channel Digital Output Module - Manual (Page 16)

16 MDO32BNS October 2005 – Issue 7
Triguard SC300E
Removal and replacement
CAUTION 3
Failure to take the faulty module off-line before removing it from the chassis could trigger a fault
alarm or cause plant shutdown .
CAUTION 4
When inserting a module ensure that it is aligned with the markings on the chassis rails and
that it engages with the upper and lower guides. Improper insertion may cause damage to the
module and/or chassis connectors.
Single-slot hot repair
Operate the On/Off Line Request switch on the faulty module, the three On Line LEDs should
all go out to indicate that the MPPs have recognised the request and taken the module off-line.
The outputs will be de-energised until the new module is on-line.
Slacken the two module securing screws and use the black ejection levers (top and bottom) to
draw the module from its slot.
Insert the new module ensuring that it engages properly in the upper and lower guides in the
chassis, the top and bottom chassis rails carry alignment marks to assist. Pull out the
ejection levers and as the module is pushed back engage the levers on the chassis rails. The
levers should then be used to draw the module into position, some resistance will be felt as the
rear connector pins engage. The module should be fixed in position with the securing screws.
Operate the On/Off Line Request switch and check that the three On Line LEDs illuminate for
one second, extinguish for one second and then illuminate permanently to indicate that the
module has been put on-line. All outputs that are required to be energised by the system logic
will be re-energised. If the LEDs do not illuminate either the first or second time or fail to remain
illuminated, then the module must be considered faulty.
NOTE
If the replacement board comes on-line but the health LED is extinguished a fault still exists. If
the failure is LFD this may indicate a field fault (open circuit) and the field loops should be
investigated.