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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
7-22 A5E00105475-03
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This chapter contains the specifications for analog outputs of CPUs 31xC.
The table includes the following CPUs:
• under CPU 314C-2, the CPU 314C-2 DP and CPU 314C-2 PtP
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Number of inputs 4 channels with current/voltage input
1 channel with resistance input
Cable length
• Shielded max. 100 m
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Resistance input
• No load voltage typically 2.5 V
• Measurement current typically 1.8 mA to 3.3 mA
electrical isolation
• between the channels and the backplane bus Yes
• between the channels No
permitted potential difference
• between the inputs (AI
C
) and M
ANA
(U
CM
) 8.0 VDC
• between M
ANA
and M
internal
(U
ISO
) 75 VDC / 60 VAC
Insulation test voltage 600 VDC
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Measurement principle Actual value encoding (successive
approximation)
Integration time/conversion time/resolution (per channel)
• Configurable Yes
• Integration time in ms 2.5 / 16.6 / 20
• permitted input frequency max. 400 Hz
• Resolution (including overdrive) 11 bits + signed bit
• Suppression of interference frequency f1 400 / 60 / 50 Hz
Time constant of the input filter 0.38 ms
Basic processing time 1 ms
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