Siemens S5-135U/155U appendix Write, Acknowl- edged by module with RDY

Monitoring Module

10.3 Operation

Switch S1 (Read) The addresses set at these switches are acknowledged by the monitoring

and S2 (Write) module with RDY/ and are therefore not to be used again for inputs and outputs in this programmable controller (double addressing is not allowed).

Switch S3 (Listen) No acknowledgement signal (RDY/) is returned by the monitoring module to

and S4 (Listen) 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

S1

S2

Input address can be accessed using MEMR/ (READ)

*

Output address can be ac-

cessed using MEMW/

(WRITE)

*

Acknowl- edged by module with RDY/

*

*

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.

10-8	System Manual
	C79000-G8576-C199-06