Signal modules
5.1 SM500 signal module
SIMATIC TDC hardware
108 System Manual, 08/2017, A5E01114865-AL
Incremental encoder input settings
Depending on the type of encoder used (15 V or 5 V encoder), switches S1 and S2 must be
set on the module corresponding to the following table.
Each track (A/VW, B/RW, N/-) of a channel has a switch that can be used to set the
appropriate encoder type:
● Switch open (OFF):
15 V encoder, switching threshold 7 V
● Switch closed (ON):
5 V encoder, switching threshold 0 V
All tracks (A/VW, B/RW, N/-) of a channel must have the same switch setting for operation.
using a TTL incremental encoder you must note that you cannot switch the control
input to TTL signals. The control input only reacts to a HTL level.
Settings for encoder type with switches S1 and S2
Table 5- 4 Switch settings for 5 V and 15 V encoders
Encoder 1
OFF ON
Encoder 2
OFF ON
Encoder 3
OFF ON
Encoder 4
OFF ON
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