Siemens SIMATIC S5 Equipment Manual

Operating Instructions
R 02/92
If one of the setpoints or a zero shift value is supplied with an interrupt identifier, the module must
be set to a group interrupt bit of the peripheral byte PYO via jumper adjustment.
The number of this group interrupt bit must be specified at parameter
ABIT (in the interrupt OB):
ABIT :
KY = x,y x ><0 No reset of the pertaining interrupt bit in the system data
x = O Reset of the pertaining interrupt bit in the system data
osy<–7
Number of the interrupt bit
See the Equipment Manual for the S5–150S/U.
When an interrupt occurs (analog to the jumper setting) the corresponding interrupt OB is called.
The call for the function block FB 157 with the command = KB (read track identifier bit) is entered
into this alarm
OB. After the call the parameter ST shows from which channel the interrupt origi-
nated.
Now you can have your specific interrupt program processed.
A recommendation for interrupt OB programming is shown in the example in section 2.3.
If an interrupt occurs during processing of function block FB 157 in
the cyclic program, the group interrupt at the bus is cancelled by
FB 157 (or by reading byte 7).
Consequently no interrupt identity bit can be evaluated in the alarm
OB.
In the function block, howeve~ the control bits are updated, so that
depending on the interrupt identifier bits saved in the flag? your specific
interrupt rogram can be called. This means the information from which
[
channel t e interrupt originated is stored in the control byte (ST).
Therefore after each call of FB 157 in the cyclic program, both
1P 241
interrupt bits must be scanned!
After being evaluated, the control bits in the interrupt
OB must be
reset so that the interrupt programs (FBxx and FByy) are not processed
in the cyclic program again.
This is taken into account in the example in section 2.3.
2 – 14
1P 241 Equipment Manual
@ Siemens AG 1989, Order No.: 6ES5 998-0KD21
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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)