Siemens CPU 948 User Manual

6.1 Introduction
The operating system of the CPU 948 provides you with special
functions which you can call if necessary with a conditional (JC OB x)
or an unconditional (JU OB x) block call. Organization blocks OB 100
to 255 are reserved for these special functions.
These functions are known as integrated special functions, since they
are a fixed part of the system program. As user, you can call these
special functions but cannot read or modify the corresponding
program.
The following table provides an overview of the existing special
functions.
Block Function Refer to
section/page
OB 121 Set/read system time (compatible with CPU 946/947) 6.2/6 - 8
OB 122 "Disable interrupts" on/off 6.3/6 - 12
OB 124
OB 125
Delete STEP 5 blocks
Generate STEP 5 blocks
6.4/6 - 14
6.5/6 - 17
OB 126 Define/transfer process images 6.6/6 - 20
OB 129 Battery state 6.7/6 - 25
OB 131 Delete ACCU 1, 2, 3 and 4 6.8/6 - 26
OB 132
OB 133
Roll-up ACCU
Roll-down ACCU
6.9/6- 27
6.9/6- 27
OB 141
OB 142
OB 143
"Disable single cyclic timed interrupts" on/off
"Delay all interrupts" on/off
"Delay single cyclic timed interrupts" on/off
6.10/6 - 29
6.11/6 - 32
6.12/6 - 35
OB 150
OB 151
OB 153
Set/read system time
Set/read time for clock-controlled interrupt
Set/read time for delayed interrupt
6.13/6 - 38
6.14/6 - 43
6.15/6 - 50
OB 181 Test data block 6.16/6 - 53
OB 182 Copy data area 6.17/6 - 55
OB 200, 202
203, 204, 205
Functions for multiprocessor communication 6.18/6 - 58
OB 222 Restart cycle monitoring time 6.19/6 - 59
OB 223 Compare start-up modes in multiprocessor mode 6.20/6 - 60
OB 254, 255 Copy/duplicate DB and DX data blocks 6.21/6 - 61
Table 6-1 Overview of the special functions available with the CPU 948
Introduction
CPU 948 Programming Guide
6 - 4 C79000-G8576-C848-04

Siemens CPU 948 Specifications

General

Brand	Siemens
Model	CPU 948
Category	Controller
Language	English