Analog Modules
4-105
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Table 4-61 Assignment of the channels of the SM 331; AI 8 x 14 bits High Speed to
channel groups
Channels ... ... form one Channel Group each
Channel 0
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
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 in the reference manual.
4.20.3 Measuring Methods and Measuring Ranges of the SM 331;
AI 8 x 14 bits High Speed
Measuring Methods
You can set the following measuring methods for the input channels:
• Voltage measurement
• Current measurement
You perform the setting by means of the measuring range modules on the module
and with the “measuring method” parameter in STEP 7.
Unused Channels
You must short-circuit unused channels and connect them to MANA. In this way,
you obtain an optimum interference immunity for the analog input module. Set the
“measuring method” parameter for unused channels to “disabled”.
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