103
Indicator Possible correctionProbable cause
SD indicator is lit but RD indicator is
not lit.
The communications path selector
setting (RS-232C or RS-422) is wrong
while communications port 2 is being
used.
Select the communications path
correctly.
The cable connectors are loose. Insert the cable connectors into the
Host Link Unit securely.
The wiring of the cable is wrong. Wire the cable correctly.
The transmission or reception circuit
of the Host Link Unit is damaged.
Execute a wrap communications test
and check the operation of the
communications port.
The transmission circuit of the host
computer is damaged.
Use a protocol analyzer and check if
the host computer is transmitting
properly.
The communications setting (full
duplex or half duplex) is wrong or the
connector is wired incorrectly.
Correct the communications setting or
the wiring.
The node number setting is wrong
while communications port 2 is being
used.
Set the node number correctly.
6-3 C-mode Response Codes
A response code is returned with all responses. If a command is completed nor-
mally, a response code of 00 will be returned. If command execution ends in an
error, one of the response codes listed in the table below will be returned in the
following format. The header code will specify the command.
@xxxxxxxx
Response
code
FCS Header
code
Node no.
*s
Response
code
Description
0 0 Normal completion
0 1 Not executable in RUN mode
0 2 Not executable in MONITOR mode
0 4 The boundary of a data area in PC memory has been exceeded.
0 B Not executable in PROGRAM mode
0 C Not executable in DEBUG mode
1 0 Parity error, probably caused by noise
1 1 Framing error (stop bit(s) not detected), probably caused by noise
1 2 Overrun (Next command was received before previous command was completely processed. Lower
the baud rate if necessary and be sure to wait for a delimiter or terminator before sending the next
command.)
1 3 FCS error, possibly caused by noise (check FCS calculations)
1 4 Format error (check command format)
1 5 Entry number data error (An attempt was made to write to a read-only or write-protected area.)
1 6 The specified instruction cannot be found because search data was not present. Check the starting
address for the search and the specifications of the instruction.
1 8 Frame length error (Reduce the length of the command by splitting it into multiple frames.)
1 9 Not executable due to CPU error (Check the CPU error according to the CV-series PC Operation
Manual: Ladder Diagrams.)
2 0 I/O table generation impossible (Slave not detected, too many words allocated, or same word
allocated twice.) Check Slave settings and word allocations.
C-mode Response Codes
Section 6-3
To Next Page
Loading...
Need help?
General
