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S5-100U
6.3
Analog Modules
You can plug analog modules only into slots 0 through 7. Transfer of 65,536 different items of
information is possible per channel from or to an analog module. The memory requirement is
16 bits=2 bytes=1 word. The modules are addressed byte-by-byte or word-by-word with load or
transfer operations.
The programmable controller takes this increased memory requirement into account when an analog
module is plugged in.
•
Eight bytes (=four words) are reserved per slot.
•
Two bytes (=1 word) are reserved per channel.
•
The slot addressing area is changed.
•
The permissible address space extends from byte 64 (slot 0, channel 0) to byte 127 (slot 7,
channel 3).
0
1
Slot number
64+65
72...
CPU
66+67
68+69
70+71
...79
Figure 6-6. Address Assignment for Analog Modules
Examples: 1)
Bytes 88+89=analog module in slot 3, channel number 0
2)
Channel 1 address of an analog module in slot 5?
Solution:
Note
Any combination of analog and digital modules is possible in slots 0 through 7.
EWA 4NEB 812 6120-02
2
3
4
5
80...
88...
96...
104...
...87
...95
...103
...111
bytes 106+107
6
7
Channel number
0
112...
120...
1
2
3
...119
...127
Addressing
6-5
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