3-3
PP7,
PP17-I, PP17-II Equipment Manual
Release 06/98
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.
LEDs 1–8
}
Structure of the data in the PLC:Element assignment:
0
Keys 1–8
Key 1
LED 1
0
7
3
Bit Assignment:
Byte
Digital
inputs
1–4
1
4
Digital
input 2
(DI)
Digital inputs 1–4
Figure 3-5 Control bits for PP7
Structure of the data in the PLC:Element assignment:
0
Keys 1–8
Keys 9–16
Key 1
LED 1
Digital
inputs
1–16
Digital
output 10
Digital
input 5
Key 15
LED 15
0
1
8
16
7
11
Bit Assignment:
LEDs 1–8
LEDs 9–16
Digital inputs 1–8
Digital inputs 9–16
Digital outputs 1–8
Digital outputs 9–16
Byte
}
}
}
}
1
8
16
Digital
outputs
1–16
(DI)
(DO)
Figure 3-6 Control bits for PP17-I
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