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Hardware reference
3.12.4 Online replacement
It is possible to replace SmartSlice I/O Units connected to a GRT1-ECT
when the power is on. The I/O communication continues while a SmartSlice
I/O Unit is removed and replaced.
To replace a SmartSlice I/O Unit online, do these steps:
1. Turn off all power supplies of the SmartSlice I/O Unit. This is the I/O
power supply, plus possible external power supplies to the terminal block
(for example, a Relay Output Unit).
2. Release the locks on the front of the unit and remove the terminal block.
Do not remove the wiring.
3. Remove the main block of the unit. Replace it with a new SmartSlice I/O
Unit of the same type.
4. Attach the new unit to the system. Close the locks on the front of the unit.
5. Turn on the power supplies to the unit.
When replacing a SmartSlice I/O Unit online, note the following things:
•
When a unit is removed from the I/O communication, the withdrawn flag
of the unit is set on and the TS LED on the GRT1-ECT flashes red.
•
If I/O power supply of the unit is not turned off, there can be false output
signals, false input signals and electrical shocks.
•
Only replace one SmartSlice I/O Unit at a time.
•
If a unit is replaced with a different type of unit, there can be unexpected
outputs and the restore operation can be incomplete.
•
If the base block has faults or damage, turn off the power supply and
replace the entire unit.
When an online replacement is performed, the status word of the GRT1-
ECT reports an error (missing I/O Unit). When the I/O Unit is replaced or put
back, the status word changes to 8000 hex, but the error has already been
detected by the TJ2-MC__. To avoid this, it is necessary to mask the errors
before the online replacement is performed. To perform the online
replacement do the following:
HARDWARE REFERENCE MANUAL
254
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