OPERATION MANUAL CompoBus/S

Checking Operations of CS-series and CJ-series Master Units Section 6-3
The Master Unit’s
SD indicator is
OFF (when communications
stop
mode is not
enabled)
The Master Unit’s
RD indicator is
OFF
374
Error Probable cause Possible remedy
The Master Unit’s
ERC indicator is
ON
--- Either reset the Master Unit with the PLC’s Restart Bit or turn
the PLC OFF and then ON again. Replace the Master Unit if
the error recurs.
The communications cable is not connected
to the Master.
A Slave’s number has been set to 8 to
15 even though the usable node
address setting is IN0 to IN7 and
OUT0 to OUT7.
One of the Slaves is not turned ON.
(The Slave’s PWR indicator is OFF.)
There is a problem with the Slaves’
power supply.
The Slaves’ power supply is inadequate.
There is a problem with the communication
cable connection or the cable
itself.
Communications modes of Master
Unit and Slave do not match.
A common system mistake has been
made. (Refer to the table on page 364
for a list of common mistakes.)
Connect the communications cable correctly.
Either change the Input and Output Slave’s node number settings
so that they are 0 to 7 or change the usable node number
setting to IN0 to IN15 and OUT0 to OUT15.
Turn ON the Slave’s power supply.
The Master Unit is faulty. Replace the Master Unit.
Power is not being supplied to the
Slaves.
There is a problem with the Slaves’
power supply.
The Slaves’ power supply is inadequate.
There is a problem with the communication
cable connection or the cable
itself.
There is a non-existent node number
because a Slave’s node number was
changed after communications were
established.
The same node number is used on
two Slaves.
A registered Slave has not joined the
network (when Slave registration function
is enabled).
An unregistered Slave is in the network
(when Slave registration function
is enabled).
A common system error has occurred.
(Refer to the table on page 364 for a
list of common errors.)
Check the power supply cable connections and connect the
cables to the Slaves correctly.
Check the power supply capacity. If it is inadequate, either
change the system configuration or change the power supply
so that sufficient power is provided.
Check the connections and cable. Replace the communications
cable if it is faulty.
Set the communications mode so that it is the same as that of
the Master Unit.
Refer to the table on page 364 for common mistakes and
their remedies.
Turn ON the Slave’s power supply.
Check the power supply cable connections and connect the
cables to the Slaves correctly.
Check the power supply capacity. If it is inadequate, either
change the system configuration or change the power supply
so that sufficient power is provided.
Check the connections and cable. Replace the communications
cable if it is faulty.
Either reset the Master Unit with the PLC’s Restart Bit or turn
the PLC OFF and then ON again.
Change the Slaves’ node number settings to eliminate the
duplication and then turn the Slaves ON again. Either reset
the Master Unit with the PLC’s Restart Bit or turn the PLC
OFF and then ON again.
Check the Slave registration table and the node number setting
for each Slave.
Refer to the table on page 364 for common errors and their
remedies.
The Master Unit is faulty. Replace the Master Unit.
A Slave Unit is faulty. Replace the faulty Slave Unit.