Siemens SIMATIC S5 Equipment Manual page 41

R 02/92
Settings for two to eight 1P 241s with interrupt processing
The distinction as to which 1P has triggered the interrupt can be made by using the so–called
group interrupt (i.e., by output via the peripheral byte O (PYO)).
By means of the peripheral byte O, a programmable controller can distinguish up to eight posi-
tion decoder modules (IP 241).
For this purpose all modules must be installed in the same central
The group signals are called by parameters 0.0 to 0.7. The group for each module is switched to
the data bus via the contacts of DIP switch S2.
Master/Slave-Principle:
On the first module, the master(the group signal) is routed to bit O of the PYO; on the second mod-
ule, the slave is routed to bit 1 of the PYO and so on.
Master: On the first module contact S2.1 must be opened and contact S2.2 closed.
-t the group signal is only activated on bit O of the PYO.
Additionally on the DIP switch S2 those contacts which were assigned to the
slave modules as bits of the PYO are opened. All PYO jumpers which are
not required by a slave must be closed.
On the other 1P 241 modules with group signal, these contacts S2.1 and
Slave:
On the DIP switch S2 of the slave modules, in addition to S2.land S2.2
only that contact which will be assigned a corresponding bit of the module's
peripheral byte O is closed. The other seven S2 contacts on the slave
modules must be opened.
Example:
DIP switch
Bit O .10 Group interrupt
Bit 1 .9 –"-
Bit 2 .8
— ~' —
Bit 3 .7
Bit 4 .6
Bit 5 .5
Bit 6 .4 –"-
Bit 7 .3
.1 Change over: Only OB2 (o en)
AG 1989, Order No.: 6ES5 998-0KD21
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or OB2 to B 9 (closed) 8
Operating Instructions
x = closed – = o~en
Master Slave 1
—
x
—
x
—
X
—
x
—
X
—
X
— —
—
x
x
x
—
x
Slave 6
—
—
—
—
—
—
x
—
x
x
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