Siemens S7-300 Analog inputs, Technical data Module-specific data, Voltage, currents, potentials

Technical data of CPU 31xC 6.6 Technical data of the integrated I/O

6.6.8Analog 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 (AIC) and MANA (UCM)		8.0 VDC
• between MANA and Minternal (UISO)		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

CPU 31xC and CPU 31x, Technical data	6-51
Manual, Edition 08/2004, A5E00105475-05