Siemens SIMATIC S5 Manual page 217

Function
Error number 1
indicated in 2
KF format 3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
26
–128
AFEH: Q, BI
BFEH: Q, BI
5–12
Wrong firmware
Type of addressing not permitted
Module address not permitted
Module address not in increments of 32
DB no. (DB-A) or DB type not allowed
DB-A does not exist or too short
DB-B does not exist or too short
DB-C does not exist or too short
Command not permitted
Message number (T-NR) not permitted
DB no. (DB-A') or DB type not allowed
DB-A' does not exist or too short
DB-C' does not exist or too short
Command "LE" or "automatic reading after self-tuning" is
selected in FB 162, but not released on the IP 244, i.e. main
control byte 1, bit 2 is at present 0
Module cannot be addressed at present because self-tuning
function active
Timeout during cold restart
Acknowledgement delay (timeout) IP 244 (not valid with the
S5-115U, CPU 941 to CPU 944 and CPU 941B to CPU 944B)
Wrong CPU (only with the S5-115U, CPU 945)
Acknowledgement delay (timeout) (only with the S5-115U,
CPU 941 to CPU 944 and CPU 941B to CPU 944B)
(indicated in ISTACK:FB162 condition code QVZ;
status FY255 = KF –128)
Sampling error, sampling time exceeded
The parameter AFEH is set if the bit "sampling time overflow"
(message 16, byte 0, bit 5) is set. The set parameter does not
influence the processing in the function block. The bit "sampling
time overflow" can be reset by switching off the power supply or
by transferring message number 15 once with the command AE
(change the parameters of a controller).
Module error
The parameter BFEH is set when the signal state of the watchdog
bit does not change within 1 second.
(Data block DB-B, data word 32, bit 15.)
If the function block operating an IP 244 is called at intervals
greater than 1 second, the correct evaluation of the watchdog bit
is no longer possible.
IP244
C79000–B8576–C861–02