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363
Checking Operations for CS-series, C200HX/C200HG/C200HE-(Z)E, and C200HS Master Units
Section 6-2
A Slave Unit’s
COMM indicator
is OFF or its ERR
indicator is ON
An error has occurred at the Master
Unit.
Check the Master Unit’s indicators and follow the procedures
listed above.
The Slave cannot participate in com-
munications because its power supply
is OFF. (The Slave’s PWR indicator is
OFF.)
Turn ON the Slave’s power supply.
The Slave cannot participate in com-
munications because there is a prob-
lem with the Slaves’ power supply.
Check the power supply cable connections and connect the
cables to the Slaves correctly.
The Slave cannot participate in com-
munications because its power supply
is inadequate.
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.
The Slave cannot participate in com-
munications because there is a prob-
lem with the communication cable
connection or the cable itself.
Check the connections and cable. Replace the communica-
tions cable if it is faulty.
The same node number is used on
another Slave.
Change one of the Slave’s 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.
A Slave’s number has been set to 8 to
15 even though the usable node num-
ber setting is IN0 to IN7 and OUT0 to
OUT7.
Either change the Input and Output Slave’s node number set-
tings so that they are 0 to 7 or change the usable node num-
ber setting to IN0 to IN15 and OUT0 to OUT15.
Communications modes of Master
Unit and Slave do not match.
Set the communications mode so that it is the same as that of
the Master Unit.
A common system mistake has been
made. (Refer to the table on page 364
for a list of common mistakes.)
Refer to the table on page 364 for common mistakes and
their remedies.
The Slave Unit is faulty.
Replace the Slave Unit.
The area used by the Analog Terminal
or 32-point Connector Terminal
exceeds the range of the Master Unit
I/O Area.
Change to node numbers that do not exceed the I/O Area
range, then turn ON the PLC again.
The indicators on
the Master and
Slaves are nor-
mal, but there are
errors in the com-
munications data
The same node number is set on two
or more Input Slaves or Output
Slaves.
Check the Active Node Flags for the Master and see whether
the flags are ON for all of the connected Slaves. If two Slaves
have the same node number, change the Slaves’ node num-
ber settings.
The PLC’s Output OFF Bit is ON, so
the Output Slave outputs are always
OFF.
Turn OFF the PLC’s Output OFF Bit.
The communications power supply to
the Slaves is ON, but the I/O power
supply is OFF, so the Output Slave
outputs and Input Slave inputs are
always OFF.
Provide an I/O power supply to the Slaves.
There is a problem with the communi-
cation cable connection or the cable
itself.
Check the connections and cable. Replace the communica-
tions cable if it is faulty.
Usable node numbers setting is incor-
rect.
4-1-3 I/O Allocations in CS-series, C200HX/
C200HG/C200HE-(Z)E, and C200HS PLCs
and reset the
usable node numbers to correct values.
The Analog Terminal is connected to a
C200HW-SRM21 (without V1).
Change the Master Unit to a C200HW-SRM21-V1.
A common system mistake has been
made. (Refer to the table on page 364
for a list of common mistakes.)
Refer to the table on page 364 for common mistakes and
their remedies.
The Master or a Slave Unit is faulty.
Replace the Slave Unit. Replace the Master Unit if the prob-
lem recurs.
Error
Probable cause
Possible remedy