Settings on the module
Make the following settings on the module to operate it with a process
alarm via interrupt:
Step
Action
1
Open jumper X4 and close jumper X3.
2
Set the interrupt line at switch row S1: the switch relating
to the desired interrupt line should be set to On. Set all
other switches to Off.
You can set the same interrupt line on several modules.
3
Set switch row S2 to Off.
4
Set switch row S3 to choose whether the interrupt is to be
initiated with a positive-going (leading) or negative-going
(trailing) edge. The setting of a pair of switches applies to
an entire byte.
Operation with
process alarm via IB 0
In this mode, a process alarm is initiated via input byte IB 0. This
mode is only possible in conjunction with a CPU 948 in
single-processor operation.
To operate the 432 digital input module with process alarm via IB 0,
you can insert it at any I/O slot.
When you use the module in the CC, you must not set any other input
module to address 0 (i.e. neither in the normal (P) nor in the extended
(O) area).
If you use the module in an EU which is addressed in the normal area,
you must not set any other input module in the EU to address 0 in the
normal area.
S1
3
3
3
Bit 3
IR-D
4
4
4
Bit 4
IR-E
5
5
5
Bit 5
IR-F
6
6
6
Bit 6
IR-G
7
7
7
Bit 7
INT
0
0
0
Bit 0
IR-A
1
1
1
Bit 1
IR-B
2
2
2
Bit 2
IR-C
Process Interrupt via IR-C
Byte 0: Positive-Going Edge
Byte 1: Negative-Going Edge
Byte 2: Both Edges
Byte 3: No Process Interrupt
Byte 0
Byte 1
Byte 2
Byte 3
S2
S3
}
}
}
}
: OF F
: ON
Figure 8-4
Switch Settings for Operation with Process Alarm via Interrupt (Example)
Technical Description
System Manual
8 - 12
C79000-B8576-C199-03
