Analog Modules
4-89
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Data for selecting a sensor
Input range (rated values) /
input resistance
• Voltage $ 5 V / 2 MΩ
1 to 5 V / 2 MΩ
$ 10 V / 2 MΩ
• Current 0 to 20 mA / 250 Ω
4 to 20 mA / 250 Ω
$20 mA / 250 Ω
Maximum input voltage for
voltage input
(destruction limit)
35 VDC continuous;
75 VDC for max. 1 s
(duty factor 1:20)
Maximum input current for
current input
(destruction limit)
40 mA
Connection of the sensor
• For measuring voltage Possible
• For measuring current
As two-wire transmitter Possible with separate
supply for the
transmitter
As four-wire transmitter Possible
1)
Interference frequency for 4-channel mode is “All”
2)
Interference frequencies 50/60/400 Hz are designated as
“All”
3)
Series-mode rejection for
8-channel mode is reduced as follows:
50 Hz > 70 dB
60 Hz > 70 dB
400 Hz > 80 dB
50/60/400 Hz > 90 dB
4.19.1 Commissioning the SM 331; AI 8 x 16 bits
The mode of operation of the SM 331; AI 8 x 16 bits is set with STEP 7.
Parameter
You will find a description of the general procedure for parameterizing the SM 331;
AI 8 x 16 bits, in section 4.7.
Parameterization restrictions when using the analog input module SM 331;
AI 8 x 16 bits with PROFIBUS masters that only support DPV0.
When you use the isolated analog input module SM 331; AI 8 16 bits in an
ET200M PROFIBUS slave system with a PROFIBUS master which is not an S7
master, certain parameters are not permitted. Masters that are not S7 masters do
not support hardware interrupts. So all the parameters associated with these
functions are deactivated. The deactivated parameters are hardware interrupt
enable, hardware restrictions and end-of-scan-cycle interrupt enable. All the other
parameters are permitted.
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