Siemens S5-135U/155U System Manual page 507

Example 2
S5-115U
S1 e.g.
S2 e.g.
S3
S4
User program in OB 1 or FB 0
without S5-DOS
L
T
L
T
L
T
BE
6) When using the monitoring module in the S5-115U, always select addresses > 127 since that is the only way to address
byte to byte.
7) To achieve maximum fault detection, select inverse addresses > 127, e.g. 213 (D5H) and 170 (AAH). In this combination,
the address bit ADB 7 is not monitored
8) If ADB 7 is also to be monitored, the address 84/85 (54H/55H) in the last expansion unit must be occupied by an input or
output module and cyclically accessed by the user program. Set address 85 (55H) in place of 213 (D5H) at switch S3 of all
monitoring modules. Select any address between 128 (80H) and 255 (FFH) for switch S1 of the monitoring module in the
last expansion unit. As an alternative, you may access the address at S1 of the monitoring module in the last expansion unit via
direct access (without process image) using L PB 85 or L PY 85. Then, the addresses 84 and 85 (54H) and (55H) in the process
image may no longer be used by other inputs. The address at S3 of all monitoring modules is then also to be set to 85 (55H).
System Manual
C79000-G8576-C199-06
6)
128 (80H) e.g.
6)
128 (80H) e.g.
7)
213 (D5H)
8)
7)
170 (AAH)
with S5-DOS
PB 128 L PY
PB 128 T PY
PB 129 L PY
PB 129 T PY
8)
PB 213 L PY
PB 170 T PY
BE
.
Monitoring Module
6)
129 (81H) 213 (D5H)
6)
129 (81H) 170 (AAH)
7)8)
213 (D5H) 213 (D5H)
7)
170 (AAH) 170 (AAH)
128
128
129
129
8)
213
170
6)
6)
7)8)
7)
10-11