Siemens SIMATIC PP7 Equipment Manual page 31

The figures below illustrate the structure of the data areas in the PLC which are
assigned to the Push Button Panel. It is important to note that two control bits
are assigned to each LED and each output, and the bits are distributed on
successive bytes. The combination of these bits determines the appearance of
the LED or display element.
Element assignment:
Digital
inputs
(DI)
1–4
1
4
Figure 3-5 Control bits for PP7
Element assignment:
Digital Digital
inputs outputs
1 1
(DO)
(DI)
1–16 1–16
8 8
16 16
Figure 3-6 Control bits for PP17-I
PP7, PP17-I, PP17-II Equipment Manual
Release 06/98
www.gkbpx.com
Structure of the data in the PLC:
Bit
7
Byte 0
Key 1
LED 1
3
Digital
input 2
Structure of the data in the PLC:
Bit
7
Byte 0
Key 1
LED 1
Key 15
LED 15
11
Digital
input 5
Digital
output 10
Assignment:
0
Keys 1–8
Digital inputs 1–4
}
LEDs 1–8
Assignment:
0
Keys 1–8
Keys 9–16
Digital inputs 1–8
Digital inputs 9–16
}
LEDs 1–8
}
LEDs 9–16
}
Digital outputs 1–8
}
Digital outputs 9–16
3-3
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