Siemens SIMATIC S5 Manual page 80

Description of the Firmware
Fig. 1.1.5/2 Response at the tolerance limits
a Error bit "1st pos. tolerance exceeded" is set.
b Error bit "1st pos. tolerance exceeded" is reset.
c Error bit "2nd pos. tolerance exceeded" is set and controller disabled, if
programmed.
d Error bit "2nd pos. tolerance exceeded" is reset, controller resumes operation.
e Error bit "below 1st neg. tolerance" is set.
f Error bit "below 2nd neg. tolerance" is set and the controller disabled, if
programmed.
g Error bit "below 2nd neg. tolerance" is reset. If the controller was disabled, it only
resumes operation if the commands "KS", "AE", "PA" or "AS" are executed in
FB 162.
h Error bit "below 1st neg. tolerance" is reset.
The extreme value acquisition is active whenever the actual value is outside the 1st tolerance band.
If the actual value returns to the 1st tolerance band, the extreme value acquisition is reset and only
restarted when the value once again leaves the tolerance band. Old extreme values are retained
until new values are detected.
The table below shows how the displays and tolerance evaluations are combined (not applicable
when heating current acquisition is selected):
*) IP internal, the actual value is set to "0".
4–12
IP244
C79000–B8576–C860–02