Omron GRT1 - 11-2007 Operation Manual page 317

Troubleshooting by Unit
Troubleshooting for
Counter Units
Model
Counter Units The count pulses can-
not be detected.
GRT1-CT1(-1)
GRT1-CP1-L
The pulses are not
counted properly.
The count value is not
reset even when the
phase-Z pulse is input.
The output does not
change even if the
actual counter value
exceeds the upper or
lower limit.
The actual output is
reversed compared with
setting range.
The Unit does not
respond at the rising
edge and falling edge of
the digital input wave-
length.
296
Details
Input wiring is performed incorrectly.
The I/O power is not being supplied.
Connections between the base blocks of
the Slice I/O Unit are not made properly.
(Refer to the following figure.)
The terminal block is disconnected.
The counter input mode setting is incor-
rect.
The Gate Control Bit was set to disable
counting.
The counter input interface is not set
correctly (CRT1-CP1-L only)
The pulse frequency exceeds the maxi-
mum value for the specifications of the
Unit or exceeds the maximum value for
the mode that is set.
The counter input mode setting is incor-
rect.
The wiring for digital input or the phase-
Z input is incorrect.
The digital input counter reset is set
incorrectly (GRT1-CT1(-1) only).
The phase-Z input counter reset function
is not set correctly (GRT1-CP1-L only).
The range setting is incorrect.
The Output Control Bits are set to keep
the output either ON or OFF.
The range limit settings are not correct
(GRT1-CP1-L only).
The upper and lower limits for the range
are reversed.
The digital input is disabled.
The digital input setting is incorrect.
Probable cause
The I/O power supply
connectors on the Slice I/O
Units are not interlocked
properly.
Section 9-5
Remedy
Check the input wiring for
phases A and B.
Check whether the I/O power
is being supplied.
Check whether the connec-
tions are made properly.
Check whether the terminal
block is disconnected.
Set the count input mode cor-
rectly and restart the Unit.
Turn OFF the Gate Control
Bit (to enable counting).
Set the counter input inter-
face using the DIP switch on
the Unit.
Set the pulse frequency to
within the Units specifications
or within the maximum value
for the mode.
Set the count input mode cor-
rectly and restart the Unit.
Check the wiring for the digi-
tal input or the phase-Z input.
Set the Digital Input Counter
Reset Mode Bit to 10.
Set Counter Reset Mode Bits
for the phase-Z input to 10.
Change the upper and lower
limits using the Configurator.
Range 0 corresponds to out-
put 0 and range 1 corre-
sponds to output 1.
Set the Output Control Bits to
00.
Range 0 applies to output 0,
and range 1 applies to output
1.
Exchange the upper and
lower limits.
Enable the digital input.
Set the digital input using the
Configurator.