Siemens SIMATIC S5 Manual page 135

Data Exchange with the Central Controller
Byte 0/1 Actual value normalization
If the linearization of the characteristic curve is disabled for any controller in control
byte 2, bit 3 and if no Pt 100 operation has been selected, the normalization
between the input voltage and temperature value can be selected by entering a
value. The value to be entered is the temperature which corresponds to 25 mV at
the module input (or 250 mV if the ADC sensitivity has been changed with jumpers
X8/X9 1, 2 and 3). As an example, 25 mV corresponds to 317 C, therefore
value 317 should be entered (or 250 mV corresponds to 183 C
The sensors are not checked for line breaks.
Byte 2 If a value is entered here, the temperature difference between two measurements
compared with the preset value can be used to detect a short circuit at the input.
The error messages are then written to error bytes 0a to 12a for the respective
controller.
This value depends on the system/machine and must be determined by the user.
The following can be used as a guide for the input:
Under these conditions, short circuit detection is possible, providing that the
controlled system heats up uniformly and that actual value acquisition is free of
disturbances. The value specified for the minimum temperature difference should
be as small as possible.
Byte 3,4,5 Free
Byte 6,7,8,9 These values are determined by the heating curve of the system. See Chapter 4
at the end of these programming instructions.
Bytes 10 to 13 Free
Byte 22/23 These values are determined by the heating curve of the system.
Byte 24/25 See Chapter 4 at the end of these programming instructions.
Bytes 26 to 30 Free
Messages 43, 44, 45
4–68
minimum temperature difference < 50% of the maximum rate
Free
enter 183).
when heating
C79000–B8576–C860–02
IP244