Siemens CPU 948 User Manual

Assignment of system data
word RS 137
Test function Bit no.
Check the code of the system program 2
Check the code of the STEP 5 logic blocks in the
user memory
5
Check the address lines 7
Check the clock 10
Check the BASP signal 11
Check the cycle time monitoring 13
Test the user memory 15
The bit numbers not listed in the table are not used.
5.7.4
Error Handling Providing the test function is not running within an OVERALL
RESET, the test function calls error OB 36 (refer to Section 5.6.11) if
an error is detected and transfers the content of RS 137 containing the
bits of the activated test routines to ACCU 1.
All the test routines also enter information about the type of test and
error detected in the system data words RS 75 to RS 78.
For test components which only run in an OVERALL RESET, the
cause of the error is indicated in RS 75. The STOP LED then flashes
quickly, when the tests are completed with an error in an
OVERALL RESET.
Errors detected by the self-test component "BASP signal" in the STOP
mode are also indicated in RS 75. The following START-UP only
leads to cyclic operation if no STP operation is programmed in
OB 36.
Self-Test
CPU 948 Programming Guide
5 - 38 C79000-G8576-C848-04

Siemens CPU 948 Specifications

General

Brand	Siemens
Model	CPU 948
Category	Controller
Language	English