Siemens SIMATIC S5 Manual page 221

Function
Assignment in the data blocks
DB-A or DB-A'
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from DW Assignment
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0 Parameter assignment and working area
of the function block
16 Message
32 Message
48 Message
64 Message
80 Message
96 Message
112 Message
144 Message
160 Message
176 Message
192 Message
208 Message
224 Message
240 Message
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Messages 13 and 14 do not exist in data block DB-A'. The area free for the user begins from
data word 244.
DB-B
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from DW Assignment
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0 Working area of the function block (reserved)
16 Message
32 Message
48 Message
64 Message
80 Message
96 Message
112 Message
128 Message
143 Message
158 Message
173 Message
188 Message
204 – free for the user –
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5–16
0: data for controller 0
1: data for controller 1
2: data for controller 2
3: data for controller 3
4: data for controller 4
5: data for controller 5
6: data for controller 7
8: data for controller 8
9: data for controller 9
10: data for controller 10
11: data for controller 11
12: data for controller 12
13: data for controller 13
14: data for controller 14
15: main control bytes, general parameters
16: status information, error messages
17: actual values
18: manipulated variables
19: minimum values
20: maximum values
21: cumulative setpoints (for cascaded control)
22: (curve values 1 – 15 channel 13)
23: (curve values 16 – 30 channel 13)
24: (curve values 31 – 45 channel 13)
25: (curve values 46 – 60 channel 13)
46: error messages controllers 0 – 12
IP244
C79000–B8576–C861–02