Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 161)

Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
6-51
6.6.8 Analog inputs
Introduction
This chapter contains the specifications for analog outputs of CPUs 31xC.
The table includes the following CPUs:
•
CPU 313C
• CPU 314C-2 DP
• CPU 314C-2 PtP
Technical data
Table 6-14 Technical data of analog inputs
Technical data
Module-specific data
Number of inputs
4 channels with current/voltage input
1 channel with resistance input
Cable length
• Shielded Max. 100 m
Voltage, currents, potentials
Resistance input
• No-load voltage Typically 2.5 V
• Measurement current Typically 1.8 mA to 3.3 mA
Electrical isolation
• Between channels and the backplane bus Yes
• Between the channels No
Permitted potential difference
• Between 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
Analog value generation
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