Siemens Simatic S7-400 - Page 102

Event Class 8 (08H): "Receive error"
Event No. Event To correct or avoid errors
(08)0CH Transmission error:
• Transmission error (parity error, stop bit error,
over󹪞ow error) detected.
With 3964(R) only:
• If faulty character is received in idle mode, the
error is reported immediately so that disturban‐
ces on the transmission line can be detected ear‐
ly.
With 3964(R) only:
• If this occurs during send or receive operation,
repetitions are initiated.
Faults on the transmission line cause message frame
repetitions, thus lowering user data throughput. Dan‐
ger of an undetected error increases. Change your sys‐
tem setup or the line routing.
Check the cable of the communications partner or
check whether both devices have same setting for
baud rate, parity and number of stop bits.
(08)0DH BREAK:
Receive line to partner is interrupted.
Reconnect or switch partner on again.
(08)0EH Receive bu󹪜er over󹪞ow when 󹪞ow control not ena‐
bled.
The function block to be received must be called more
often in the user program, or communication with
󹪞ow control must be con󹪝gured.
(08)10H Parity error Check the cable of the communications partner or
check whether both devices have same setting for
baud rate, parity and number of stop bits.
(08)11H Character frame error Check the cable of the communications partner or
check whether both devices have same setting for
baud rate, parity and number of stop bits.
Change your system setup or the line routing.
(08)12H For ASCII driver only:
More characters were received after the CP had sent
XOFF or set CTS to OFF.
Reassign the parameters for the communication part‐
ner, or deal with the data in the CP more quickly.
(08)14H For ASCII driver only:
A message frame or several message frames have
got lost, because you have been working without
󹪞ow control.
Work with 󹪞ow control as much as you can. Use the
entire receive bu󹪜er. Set the "Reaction to CPU Stop"
parameter in the basic parameters to "Continue".
(08)16H The length of a received message frame was longer
than the maximum speci󹪝ed length.
Correction required at the partner
(08)20H Static error when calling the SFC RD_REC. The
RET_VAL return value of the SFC is provided in the
SFCERR variable in the instance DB for evaluation.
Analyze the SFCERR variable from the instance DB.
Event class 11 (0B8H): "Warnings"
Event No. Event To correct or avoid errors
(0B)01H Receive bu󹪜er more than 2/3 full Call the receive block more often to avoid the receive
bu󹪜er over󹪞owing.
Event class 128 (80H): "Module error"
Event No. Event To correct or avoid errors
(80)00H Module 󹪝rmware not found Perform a 󹪝rmware update
Diagnostics with the CP 440
8.3 Diagnostics Messages of the Function Blocks
Point-to-point connection CP 440 Installation and Parameter Assignment
102 Equipment Manual, 03/2022, A5E00057742-AE