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Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
A5E00213444-02
Channel groups
The channels of the SM 331; AI 8 14 Bit High Speed are arranged in four
groups of two. You can only ever assign parameters to one channel group.
The SM 331; AI 8 14 Bit High Speed has a measuring range module for each
channel group.
The table below shows which channels are parameterized as a channel group in
each case. You will need the channel group number to set the parameters in the
user program with an SFC.
Table 9 Assignment of the channels of the SM 331; AI 8 14 Bit High Speed to
channel groups
Channels ... ... form one Channel Group each
Channel 0
Channel 1
Channel group 0
Channel 2
Channel 3
Channel group 1
Channel 4
Channel 5
Channel group 2
Channel 6
Channel 7
Channel group 3
Special characteristic of channel groups for hardware interrupts
You can set hardware interrupts in STEP 7 for the channel groups 0 and 1. Note,
however, that a hardware interrupt is set only for the first channel in the channel
group in each case – in other words, for channel 0 or channel 2.
Diagnostics
You will find the diagnostic messages that are grouped under the “group diagnosis”
parameter in Table 4-47 on page 4-73 of the reference manual.
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