Analog Inputs - Siemens CPU 31 Series Technical Data Manual

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
Cable length
Shielded
•
Voltage, currents, potentials
Resistance input
No-load voltage
•
Measurement current
•
Electrical isolation
Between channels and the backplane bus
•
Between the channels
•
Permitted potential difference
Between inputs (AI ) and M
•
C
between M and M
•
ANA
Insulation test voltage
Analog value generation
Measurement principle
Integration time/conversion time/resolution (per channel)
Configurable
•
Integration time in ms
•
Permitted input frequency
•
Resolution (including overdrive)
•
Suppression of interference frequency f1
•
Time constant of the input filter
Basic processing time
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
(U )
ANA CM
(U )
internal ISO
Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
4 channels with current/voltage input
1 channel with resistance input
Max. 100 m
Typically 2.5 V
Typically 1.8 mA to 3.3 mA
Yes
No
8.0 VDC
75 VDC / 60 VAC
600 VDC
Actual value encoding (successive
approximation)
Yes
2,5 / 16,6 / 20
Max. 400 Hz
11 bits + signed bit
400 / 60 / 50 Hz
0,38 ms
1 ms
6-49