Siemens S5-135U/155U - Manual (Page 504)

10-8
System Manual
C79000-G8576-C199-06
10.3 Operation
The addresses set at these switches are acknowledged by the monitoring
module with RDY/ and are therefore not to be used again for inputs and
outputs in this programmable controller (double addressing is not allowed).
No acknowledgement signal (RDY/) is returned by the monitoring module to
the addresses set the switches S3 and S4. These addresses must be accessed
by the programmable controller as input or output addresses. This means that
they must be occupied by I/O modules or by one monitoring module at
switches S1 and S2. These modules must have been inserted into the last
expansion unit.
To achieve optimum address bus monitoring, inverse addresses should be
used [e.g. 85 (55H)
2) and 170 (AAH)]. It is advisable to make sure that the
setting of switches S3 and S4 is the same on all monitoring modules used.
The setting of switches S1and S2 as well S3 and S4 should be the same on
the monitoring module in the last expansion unit.
Switch
Input address
can be accessed
using MEMR/
(READ)
Output address can be ac-
cessed using MEMW/
(WRITE)
Acknowl-
edged by
module with
RDY/
S1 * *
S2 * *
S3 * *
S4 * *
1)
Select addresses 213 (D5H) and 170 (AAH) when using the module in the S5-115U.
For exceptions refer to page 10 - 13.
Switch S1 (Read)
and S2 (Write)
Switch S3 (Listen)
and S4 (Listen)
Monitoring Module