Error Detection Processing - Omron G9SP-N20S Network Connection Manual

9.3. Error Detection Processing

This project file detects and handles errors (1) to (3). For information on error codes, refer to
9.7 Error Status List.
NJ501-1500+
CJ1W-SCU42
(1) Errors during execution of SerialSend/SerialRcv instructions (communications instruction
errors)
An error end of SerialSend/SerialRcv instruction due to an incorrect SCU Unit setting or
incorrect variable setting, etc is detected as a communications instruction error. The error is
detected with the error flag (Error) at the execution of an instruction.
(2) SCU Unit errors (Unit errors)
An error that prevents the SCU Unit from being ready for communications is detected as a
Unit error. This error is detected when a timeout occurs.
(3) Errors in the destination device (Destination device errors)
An error that occurs during communications with a destination device is detected as a
destination device error. Destination device errors include a transmission error caused by a
destination device's command error, parameter error, data error and an error that prevents
execution, character corruption or unmatched baud rate setting. The error is detected with
the response data which is sent from the destination device.
With this project file, the destination device error is detected when there is a difference
between a normal receive message (hereinafter referred to as a normal message) and an
error receive message (hereinafter referred to as an error message). (Refer to 9.2.3.
Send/Receive Message for details.)
Normal #40
message
Start code
(Normal
response)
Error #40
message
Start code
(Error
response)
Serial cable
(1) (2)
#0000C3 #0000
Response End code
length
#000009 #0000
Response End code
length
Destination device
(3)
#CB 188Byte
Service Data Checksum
code
#CB #****
Service Reserve Checksum
code data
9. Project File
#**** #2A0D
Delimiter
#**** #2A0D
Delimiter
33