OPERATION MANUAL CompoBus/S

Checking Operations for CS-series, C200HX/C200HG/C200HE-(Z)E, and C200HS Master Units Section 6-2
6-2 Checking Operations for CS-series, C200HX/C200HG/
C200HE-(Z)E, and C200HS Master Units
6-2-1 Indicators
Errors and Troubleshooting
Situation Indicator status Probable cause Possible remedy
RUN ERC SD RD
Normal communications
ON OFF ON ON --- ---
PLC’s power OFF OFF OFF OFF OFF The PLC’s power is OFF. Turn the PLC’s power supply ON.
Not connected to OFF OFF OFF OFF The Master is not completely Mount the Master properly.
Backplane
connected to the Backplane.
CPU Unit standby sta- OFF OFF OFF OFF One of the Special I/O Units is Replace the faulty Unit, which will be
tus
faulty.
indicated by a“$” in the I/O table.
Special I/O Unit error OFF OFF OFF OFF Refreshing between the PLC After correcting the cause, toggle the
and Master Unit is not being Unit’s restart bit in the AR Area.
performed properly.
Replace the Unit if it doesn’t reset
when the restart bit is toggled.
I/O UNIT OVER error OFF OFF OFF OFF The same unit number has Set unique unit numbers.
been set on two or more Special
I/O Units.
If the usable node numbers are
within IN0 to IN15 and OUT0 to
An out-of-range unit number OUT15, 9 or F cannot be set. node
has been set.
numbers A to F cannot be used with
C200HX-CPU3@-(Z)E/ -CPU4@-
(Z)E, C200HG-CPU3@-(Z)E/ -
CPU4@-(Z)E, or C200HS PLCs.
I/O BUS error OFF OFF OFF OFF The I/O bus is not connected Check the I/O connecting cables
correctly. (In CS-series PLCs, between all Racks. Clear the error
an I/O BUS error may have
occurred in another Unit.)
after the connection is fixed.
Slave not connected ON OFF ON OFF No Slaves are connected, or Use a Slave that can communicate
the communications mode of properly, or make the communica-
each Slave does not match tions mode of each Slave match that
that of the Master Unit. of the Master Unit.
Communications error ON ON ON --- An error has occurred with a Check the Communications Error
with a Slave
Slave during communications Flags or indicators and clear the
and it is withdrawn from the cause of the communications error.
system.
See Communications Error Node
Number Indicators below.
Communications Error
Node Number Indicators
(C200HW-SRM21-V1 Only)
356
Note Check the system’s operation with just one Slave connected (one Slave at a
time) if the CompoBus system does not operate but the Master’s indicator status
does not match any of those in the table.
When a communications error occurs with a Slave during communications
and the ERC indicator lights, the other indicators will show the node number
of the Slave where the error occurred in binary.
When several communications errors occur simultaneously, the node number
of the Slave with the first recognized communications error will be displayed.
The display will not be changed if another communications error occurs while
a node number is already being displayed. A new node number can be displayed
after the first communications error is cleared.
When a communications error occurs in a 16-point or greater Slave, any of
the node numbers currently used by that Slave may be displayed.