Siemens SIMATIC S5 Manual page 107

Data Exchange with the Central Controller
If jumper D is open, the selected value (maximum 1024 units) corresponds directly
to the value of maximum 10.24 V (maximum 1024 units) from the analog-to-digital
converter.
Byte 2/3 Monitoring time
If owing to the failure of a thermocouple, the manipulated variable averaged over
a selected time is to be output, bit 4 in main control byte 4 must be set and the
monitoring time entered in seconds (maximum 3600 seconds). If 0 s is entered,
the IP sets the value internally to 3600 s.
Byte 4/5 Normalization factor for channel 14 (see Special Functions, Section 3.4.4)
Byte 6 Acquisition duration (channel 13) (see Special Functions, Section 3.4)
The value to be input is rounded off in steps to 3 or 6 seconds. Using T as the
calculated acquisition duration, the following rounding off values result:
Z 4
Z 8
Z 8
Measured values are read via the direct functions in FB 162.
Byte 7 Approach time, see "Hot Channel Control", Section 3.1
Byte 8 Approach manipulated variable, see "Hot Channel Control", Section 3.1
Byte 9 Approach zone, see "Hot Channel Control", Section 3.1
Byte 10/11 Approach setpoint, see "Hot Channel Control", Section 3.1
Byte 12 Maximum temperature difference
To be able to recognize disturbances in the actual temperature values, a maximum
actual value difference per minute is specified. If, for example, the maximum
temperature increase with the heating power applied is 5 C and the sampling time
is 10 s, all actual values greater than 5 C compared with the previous sample are
considered as disturbances. Such a disturbance is suppressed. Instead an actual
value is assumed which is obtained from the last actual value plus the maximum
increase. The same applies if the temperature falls.
The value you enter is rounded up to a multiple of the following units:
Byte 13 Free
Byte 14/15 Normalization factor for channel 13 (see Special Functions, Section 3.4.4)
Byte 16 Free
Byte 17 Coolant temperature (see main control byte 3 bit 4)
Byte 18,19 Free
Byte 20 Main control byte 7, facilitates communication between function block and IP 244.
4–40
3; Z 5 6 (only for 30 curve values)
6; Z 9 12
12; Z 15 18 etc.
IP244
C79000–B8576–C860–02