Siemens SIMATIC S7-1200 - Page 1431

Technical specifications
A.8 CPU 1217C
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1431
Technical data
CPU 1217C DC/DC/DC
Type: Differential input
(RS422/RS485)
Ib.2 to Ib.5 (.2+ .2- to .5+ .5-)
Common mode voltage range -7 V to +12 V, 1 second, 3 VRMS continuous (RS422/RS485 characteristics)
Built-in termination and bias 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'-'
Receiver input impedance
100 Ω including bias and termination
Differential receiver
threshold/sensitivity
+/- 0.2 V min., 60 mV typical hysteresis (RS422/RS485 characteristics)
Isolation (field side to logic)
707 V DC (type test)
Isolation groups
1
Filter times 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
HSC clock input rates (max.) Single phase: 1 MHz (Ib.2 to Ib.5)
Quadrature phase: 1 MHz (Ib.2 to Ib.5)
Differential input channel-to-channel
skew
40 ns max.
General specifications (all digital
inputs)
Number of inputs on simultaneously 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
Cable length (meters) 500 m shielded, 300 m unshielded
50 m shielded for HSC inputs (sink/source)
50 m shielded, twisted pair for all differential inputs