Technical data

11.1 Overview
You can load and test your user program using the online functions of
the STEP 5 software.
To use these functions, the CPU must be connected to the PG. The
following interfaces are available for this link:
•• link via the serial standard interface "PG - PLC",
•• link via the 2nd serial interface of the CPU 928B.
The PG functions can operate simultaneously on the two serial
interfaces. PG functions provide the following support for installing
and testing your STEP 5 program:
Function Section
Info
Size of the internal RAM and
free user memory
"Memory configuration"
List of loaded blocks "Output DIR"
Display contents of memory
words/bytes and I/O bytes
"Output address"
Memory management
Delete the whole memory "Overall reset"
Create more memory space "Compress memory
Manage blocks "Transfer/delete blocks"
Program test
Start/stop CPU "Start/stop"
Test the operation sequence in a
block
"Status block"
Test single program steps "Program test"
Display signal state of process
variables
"Status variables"
Output signals in the stop mode "Force"
Display/change process variables "Force variables"
Table 11-1 Functions for installation and testing
Overview
CPU 928B Programming Guide
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