Rockwell Automation MHB44IND Pulse Input and Analogue Output Module - Manual (Page 17)

MHB44IND October 2005 – Issue 2 17
Triguard SC300E MHB44IND Pulse Input and Analogue Output Module
REMOVAL AND REPLACEMENT
CAUTION 4
Failure to take the faulty module off-line before removing it from the chassis could trigger a fault
alarm.
CAUTION 5
When inserting a module ensure that it is aligned with the markings on the chassis rails, and
that it engages with the top and bottom chassis guides. Improper insertion may cause damage
to the module and/or chassis connectors.
Single-slot hot repair
CAUTION 6
Field loop current will not be supplied during changeover.
1. 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 last-read data input from the module will be maintained until the
new module is on-line.
2. Slacken the two module securing screws and use the black ejection levers (top and
bottom) to draw the module from its slot.
3. 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.
4. Operate the On/Off Line Request switch and check that the three On Line indicators
illuminate for one second, extinguish for one second and then illuminate permanently
to indicate that the module has been put on-line. If the indicators do not illuminate
either the first or second time or fail to remain illuminated, then the module must be
considered faulty.
Dual-slot hot repair
1. Insert the new module into the vacant hot repair slot ensuring that it engages properly
in the top and bottom guides in the chassis, the upper and lower 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