Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 357

Troubleshooting
Error conditions
Serial communi- Indicator
cations mode display
The serial com- ---
munications
mode is set to no-
protocol mode.
328
Words allocated in CIO
Status and
other condi-
tions
With Serial The ER Flag (type of condi-
Communica- tion flag) is ON.
tions Units:
The
RXDU(255)
instruction
was sent, but
reception is
not being
executed.
The Communications Port
Error Flags A21900 to
A21907 are ON.
The Communications Port
Enabled Flags (A20200 to
A20207) are OFF (execution
disabled).
Cause
Area
The setting con-
tents indicated by
the operand in the
RXDU(255)
instruction is incor-
rect.
The TXDU(256)/
RXDU(255)
instruction, or
SEND(090),
RECV(098),
CMND(490), or
PMCR(260)
instruction is being
executed using the
same communica-
tions port No.
FINS end code:
2201 hex (not pos-
sible during execu-
tion) was returned.
If the RXDU(255)
instruction was
executed, the oper-
ation is disabled
due to the port
being busy while
receiving.
FINS end code:
2202 hex (not pos-
sible while
stopped) was
returned. Execu-
tion is not possible
while the protocol
is being switched
using the
STUP(237)
instruction.
The TXDU(256)/
RXDU(255)
instruction, or
SEND(090),
RECV(098),
CMND(490), or
PMCR(260)
instruction is being
executed using the
same communica-
tions port No.
Section 11-3
Remedy
Review the con-
tents of the oper-
and for the
RXDU(255)
instruction.
Either use a com-
munications port
other than that exe-
cuting the
TXDU(256),
RXDU(255),
SEND(090),
RECV(098),
CMND(490), or
PMCR(260)
instruction, or wait
until the required
port can be used
and execute the
instruction.
Insert an AND in
the input condition
for a NO condition
of the Communica-
tions Port Enabled
Flag.
Insert an AND in
the input condition
for a NC condition
of the Serial Com-
munications Unit's
Port Settings
Change Bit
(A62001 to
A63504).
Either use a com-
munications port
other than that exe-
cuting the
TXDU(256),
RXDU(255),
SEND(090),
RECV(098),
CMND(490), or
PMCR(260)
instruction (Bits 12
to 15 of C1), or wait
until the required
port can be used
and then execute
the RXDU(255)
instruction.