Technical data

62 Diagnostics WAGO-I/O-SYSTEM 750
750-652 Serial Interface RS-232 / RS-485
Manual
Version 1.3.0
9 Diagnostics
9.1 Serial Operating Modes
Table 40: Diagnostics, Serial Operating Modes
Diagnostics
Event
Solution
Input buffer full
The I/O module receives
data via the serial interface
faster than accepted by the
application.
• Make sure that the application
always accepts data
immediately
• Reduce data traffic
• Use flow control
• Reduce baud rate
Output buffer
full
The I/O module receives
data faster from the
application than it sends via
the serial interface.
• Check continuous send
• Reduce data traffic
• Increase baud rate
• Make sure that the opposite
side accepts data
Parity error
Data transmission was
interrupted.
• Check the configuration of the
interface parameters
• Use a shielded cable
• Change wire routing
• Shorten cable
• Eliminate interference
Overflow
Data loss has occurred.
• Reduce baud rate
9.2 Data Exchange Operating Mode
Table 41: Diagnostics, Data Exchange
Diagnostics
Event
Solution
Wrong length
The I/O modules have
different process image
sizes
• Configure the same process
image size
Checksum error
Data transmission was
interrupted. The last valid
value is retained in the
process image.
• Use a shielded cable
• Change wire routing
• Shorten cable
• Eliminate interference
Timeout
The data transmission is
interrupted or has been
interrupted for a longer
period of time (see
checksum error). The
process image (input) has
been overwritten with the
value 0.
• Check cable and clamping
points for uniformity
• Check the configuration of the
I/O modules
• for checksum error: See
Diagnostics “Checksum error”