Siemens SIMATIC S7-1200 System Manual page 1431

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Table of Contents

Technical data

Type: Differential input

(RS422/RS485)

Common mode voltage range

Built-in termination and bias

Receiver input impedance

Differential receiver

threshold/sensitivity

Isolation (field side to logic)

Isolation groups

Filter times

HSC clock input rates (max.)

Differential input channel-to-channel

General specifications (all digital

Number of inputs on simultaneously

Cable length (meters)

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

CPU 1217C DC/DC/DC

Ib.2 to Ib.5 (.2+ .2- to .5+ .5-)

-7 V to +12 V, 1 second, 3 VRMS continuous (RS422/RS485 characteristics)

390 Ω to 2M on Ib'-', 390 Ω to +5 V on Ib'-', (biased OFF when T/B open-circuit)

220 Ω between Ib'+' and Ib'-'

100 Ω including bias and termination

+/- 0.2 V min., 60 mV typical hysteresis (RS422/RS485 characteristics)

707 V DC (type test)

us settings: 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 10.0, 12.8, 20.0

ms settings: 0.05, 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 10.0, 12.8, 20.0

Single phase: 1 MHz (Ib.2 to Ib.5)

Quadrature phase: 1 MHz (Ib.2 to Ib.5)

5 Sink/source inputs (no adjacent points) and 4 differential inputs at 60 °C horizon-

tal or 50 °C vertical

14 at 55 °C horizontal or 45 °C vertical

500 m shielded, 300 m unshielded

50 m shielded for HSC inputs (sink/source)

50 m shielded, twisted pair for all differential inputs

Technical specifications

A.8 CPU 1217C