Siemens SIMATIC S5 Equipment Manual

R 02/92
Operating Instructions
2.8 General Interrupt Processing with PLC S5-155U
The central processor of the programmable controller operates in two operating modes:
–S5–150U mode
–S5–155U mode
The two operating modes process interrupts differently.
S5–150U Mode
S5–155U Mode
Type of processing
Process interrupt
Interrupt
Acquisition of the interrupt via
Input byte IBO
Interrupt lines
Acquisition of the interrupt at
Block boundaries
Instruction boundaries
(level-triggered)
Jumpers on CPU 946
X46 to X49 open
X46 to X49 closed
Organization block
OB2 to OB9
OB2 to OB5
AF and AS commands affect
Yes
No
program
Effect of special function OB 122
Yes
Yes
Standard function blocks FB 38 and FB 39 must be used in the interrupt program since these
blocks save and load other temporary (system) data. These function blocks rnus[be used with the
same data block in all interrupt programs.
1P 241 Equipment Manual
@ Siemens AG 1989, Order No.: 6ES5 998-0KD21
2 – 15
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Siemens SIMATIC S5 Specifications

General

Product type designation	SIMATIC S5
Programming language	STEP 5
Digital inputs	Varies by model
Digital outputs	Varies by model
Analog inputs	Varies by model
Analog outputs	Varies by model
Supply voltage	24V DC
CPU Type	Varies by model
Memory	Varies by model
Digital I/O	Varies by model
Analog I/O	Varies by model
Communication	PROFIBUS
Operating Temperature	0°C to 60°C
Relative Humidity	5% to 95% (non-condensing)