Using The Standard Function Block Fb Im308C - Siemens SIMATIC S5 Manual

IM 308-C – addressing, diagnostics and use of the FB IM308C

9.7 Using the standard function block FB IM308C

Section 9.7
Application
Memory area on
the CPU
Control commands
9-24
Section 9.7 contains information on the following:
Section
9.7.1 Technical data and installation of the FB IM308C
9.7.2 Calling the standard function block FB IM308C
The standard function block FB IM308C transfers data between a CPU
memory area (marker area, data-block area) and the IM 308-C master
interface. You can use the FB IM308C to:
Read the inputs
Read/write the outputs
Read the diagnostics
Send and monitor the FREEZE and SYNC control commands
Change the station number (e.g. for the ET 200C DP standard slave).
The FB IM308C supports the following memory areas, always presuming
that they are supported by the CPU:
Data blocks DB
Extended data blocks DX (945, 928, 946/947, 948 CPUs only)
Marker area M
Extended marker area S (945, 928B, 946/947, 948 CPUs only)
You can use the FB IM308C to send a combination of the following control
commands to one or more groups of DP slaves:
FREEZE (freeze inputs of the DP slaves)
UNFREEZE (cancel the FREEZE command)
SYNC (simultaneously output and freeze the output states of the DP
slaves)
UNSYNC (cancel the SYNC command)
Check whether a control command issued beforehand has been completed
Topic
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Page
9-26
9-28