378
Checking Operations of CQM1 Master Units
Section 6-4
When the same error occurs in two or more Slaves, the node number of the
Slave with the first recognized error will be displayed. The display will not be
changed if the same error occurs in another Slave while a node number is
already being displayed for that error. The new node number can be displayed
after the first error is cleared.
When a communications error occurs in a 16-point Slave, either one of the
node numbers used by the Slave may be displayed.
The following table shows some examples of node number displays.
6-4-2 Error Detection with the Alarm Output (CQM1 Only)
The CompoBus/S Master Unit for CQM1 PLCs is equipped with an alarm out-
put terminal (ALM) which is shorted by an internal relay when an error occurs.
The alarm output is shorted when there is an area overlap error (ERS indica-
tor ON) or a communications error (ERC indicator ON).
The alarm output can be used to speed the response to an error by connect-
ing the output to a warning device such as a buzzer or using the alarm output
as an input to the PLC to trigger an error subroutine.
The following table shows the specifications for the alarm output terminal
(ALM). Use these specifications for reference when wiring the alarm output.
Situation Indicator status Possible remedy
ERCERSI/O8421
Area overlap in Output
Slaves with node numbers
4 and 5
--- ON ON OFF ON OFF OFF Change the node number for Output
Slave 4 or 5. Alternatively, change the
“number of points/node number” setting
to 8. Restart the PLC afterwards.
Address over error in the
Input Slave with node num-
ber 7
--- Flashing OFF OFF ON ON ON Change the node number for Input Slave
7. Alternatively, change the “PLC word
allocation” and “number of points/node
number” settings.
Communications error in
the Input Slave with node
number 13
ON OFF OFF ON ON OFF ON Check the communications cable to Input
Slave 13 and the status of the Slave itself.
Communications error in
the Output Slave with node
number 6
ON OFF ON OFF ON ON OFF Check the communications cable to Out-
put Slave 6 and the status of the Slave
itself.
Communications error in
the Input Slave with node
number 0
ON OFF OFF OFF OFF OFF OFF Check the communications cable to Input
Slave 0 and the status of the Slave itself.
A communications error
occurs in the Output Slave
with node number 11 after
a communications error
occurs in the Input Slave
with node number 3.
ON OFF OFF OFF OFF ON ON First, check the communications cable to
Input Slave 3 and the status of the Slave
itself. Once the error in Input Slave 3 is
cleared, the display will show the error in
Output Slave 11 and this error can be
cleared.
Item Specification
Maximum switching capacity 2 A (24 V DC)
Minimum switching capacity 10 mA (5 V DC)
Relay model G6D-1A
Minimum ON time 100 ms (Outputs are ON at least 100 ms.)
Circuits configuration
24 V DC max.
at 2 A
Internal
circuit
CQM1-SRM21-V1
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