Signal modules
5.1 SM500 signal module
SIMATIC TDC hardware
118 System Manual, 08/2017, A5E01114865-AL
Input voltage
• Rated voltage
• For 0 signal
• For 1 signal
24 V
-1 V to + 6 V
+13.5 V to +33 V
Input current
• For 0 signal, normally
• For 1 signal, normally
0 mA
3 mA
Delay time per channel, max. 100 µs
Encoder types that conform to technical specifications may be connected to the incremental
encoder inputs.
Connectable types Incremental encoders with 90º track
Incremental encoders with separate
Version Differential inputs,
selectable 15 V (HTL) or 5 V (TTL) encoder signal
Tracks A, B with/without zero pulse
Phase difference of track signals, min.
Interference pulse suppression
Input voltage
• 15 V – encoder:
– Valid range
– at 0 signal
– at 1 signal
• 5 V – encoder
– Valid range
– at 0 signal
– at 1 signal
-30 V to +30 V
-30 V to +4 V
+8 V to +30 V
-7 V to + 7 V
-7 V to –0.7 V
+1.5 V to +7 V
Input current
• 15 V – encoder (typ., abs.)
• 5 V – encoder (typ., abs.)
5 mA
1.5 mA
Specification as for digital inputs