Siemens SIMATIC S5 Manual page 97

Data Exchange with the Central Controller
b) For hot channel control
The sampling time can be calculated according to the notes on settings in
Chapter 4. The calculated numerical value is rounded up to match the time
base by the IP 244.
Bytes 16 Controller parameters
to 21
By setting one or more parameters to zero, different types of controllers can be
obtained.
0 = parameter in message 0 to 12 set to zero
V = required value entered in parameter in message 0 to 12
The controller parameters are restricted to the following ranges (all values binary
coded):
1 K
R
T T
A N
1
/ T T
2 A
T is the sampling time in milliseconds (or in a multiple of 10 ms depending on main
A
control byte 1, bit 2), as specified in message 0 to 12, bytes 14 and 15.
If a 2-step controller is to be used for cooling, K
point 200 C.
4–30
25599 (input in steps of 0.01)
512 T (input in multiples of 4 s)
A
512 T (in seconds)
D A
must be related to the operating
R
C79000–B8576–C860–02
IP244