Diagnostics; Serial Operating Modes; Data Exchange Operating Mode; Table 43: Diagnostics, Serial Operating Modes - WAGO 750-652 Manual

WAGO-I/O-SYSTEM 750
750-652 Serial Interface RS-232 / RS-485
9

Diagnostics

9.1

Serial Operating Modes

Table 43: Diagnostics, Serial Operating Modes

Diagnostics
Input buffer full The I/O module receives
Output buffer
full
Parity error
Overflow
9.2

Data Exchange Operating Mode

Table 44: Diagnostics, Data Exchange

Diagnostics
Wrong length
Checksum error Data transmission was
Timeout
Manual
Version 1.4.0
Event
data via the serial interface
faster than accepted by the
application.
The I/O module receives
data faster from the
application than it sends via
the serial interface.
Data transmission was
interrupted.
Data loss has occurred.
Event
The I/O modules have
different process image
sizes
interrupted. The last valid
value is retained in the
process image.
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.
Diagnostics
Solution
• Make sure that the application
always accepts data
immediately
• Reduce data traffic
• Use flow control
• Reduce baud rate
• Check continuous send
• Reduce data traffic
• Increase baud rate
• Make sure that the opposite
side accepts data
• Check the configuration of the
interface parameters
• Use a shielded cable
• Change wire routing
• Shorten cable
• Eliminate interference
• Reduce baud rate
Solution
• Configure the same process
image size
• Use a shielded cable
• Change wire routing
• Shorten cable
• Eliminate interference
• Check cable and clamping
points for uniformity
• Check the configuration of the
I/O modules
• for checksum error: See
Diagnostics "Checksum error"
59