Omron TJ2-MC64 - PROGRAMMING Programming Manual page 353

Troubleshooting
TJ2-MC64. After a short time, the I/O Unit reports its (real) correct status and
the status word becomes 8000 hex, but the MC__ has already detected the
error, even though there was no real error. Masking this particular bit of the
status word with the command MECHATROLINK(unit,37,station,value) is
not an option, because no command can be sent before the start-up
sequence, during which the error is detected, is complete.
The solution to the problem is to use the command
MECHATROLINK(unit,5,station,vr)
where:
• unit is the number of the MECHATROLINK-II Master Unit in the Motion
Controller system.
• station is the station address of the GRT1-ML2 unit set with the rotary
switches.
• vr is the VR memory address where the read code is put. Use value -1 to
print the status word to the Command Line Terminal interface.
This command clears the error of the unit, and enables turning on the
WDOG.
If this error and the problem of I/O Units that initialize slower occur, put the
command MECHATROLINK(unit,5,station,vr) in the start-up program.
6.7.1 Unit power supply errors
The UNIT PWR LED shows if the power supply to the GRT1-ML2 and to the
SmartSlice I/O system is enough to start-up and operate correctly.
/i
UNIT PWR Probable cause Correction
Not lit No power supply •
or not enough
power supply to •
1
the units
PROGRAMMING MANUAL
Check whether power is supplied to the unit power
supply terminal
Check that the supplied power is in the required
range, that is 24 VDC +10% −15% (20.4 to 26.4
VDC)
UNIT PWR Probable cause Correction
Flashing The unit power Check the power supply requirement of the entire Smart-
supply capacity is Slice I/O System and replace the power supply with one
insufficient that has enough capacity
Lit No error, the correct power is supplied to the system
1. The GRT1-ML2 can start with less power than specified. In this case, the
UNIT PWR LED can be off, although other LEDs can indicate normal
operation. However, in this case the correct operation of the whole
SmartSlice I/O system is not guaranteed.
6.7.2 I/O power supply errors
The I/O PWR LED shows if the power supply to the external I/O connected
to the SmartSlice I/O Units is enough to drive the external outputs on the
individual units.
/i
I/O PWR Probable cause
Not lit No power or not enough
power supply to the external
I/O of the SmartSlice I/O
Units
Lit No I/O power error, the correct power is supplied to the external I/O system
6.7.3 Unit errors
The GRT1-ML2 starts the initialization when the power is turned on. During
the initialization, the RUN LED and the ALARM LED are off. When the
initialization completes, the RUN LED goes on.
Possible errors during the initialization are in the table below.
Correction
• Check whether power is supplied to the I/O
power supply terminal
• Check that the supplied power is in the
required range, that is 24 VDC +10% −15%
(20.4 to 26.4 VDC)
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