Siemens SIMOTION Operating Instructions Manual page 64

Interfaces
4.6 Onboard measuring system interface (C230-2, C240)
Note
Please note the following:
● The most significant data bit for the encoder's entire range of values is transmitted by the
encoder with the first cycle.
● Subsequent data bits transmitted by the encoder (or zeros) are not evaluated by
SIMOTION C.
● The encoder used in the example should be configured as follows:
– Encoder pulses per revolution: 4096
– Data width: 12
– Message length: 13 bits (or 21 bits or 25 bits)
– Message profile: Right-justified
Encoder supply 5 V
The 5 V supply voltage for the encoders is generated inside the module and is therefore present
at the Sub-D socket. This means you can supply the encoders via the connecting cable without
the need for additional wiring. The voltage supplied is protected electronically against short
circuits and thermal overload, and it is monitored. The encoder supply is not isolated from the
load power supply to the module.
Encoder supply 24 V
For encoders with an operating voltage of 24 V, the 24 VDC power is supplied to the Sub-D
sockets. This means you can supply the encoders via the connecting cable without the need
for additional wiring. The voltage supplied is protected electronically against short circuits and
thermal overload, and it is monitored. The encoder supply is not isolated from the load power
supply to the module.
Behavior of the integrated measurement electronics
Pulses from connected incremental encoders are quadrupled (for pulse quadruplication, see
figure "Signal shapes of incremental encoders").
The actual encoder values are latched servo-synchronously in the C230-2/C240.
Note
With certain selected set values for the position control cycle clock, the measured value
sampling in the C240 takes place at time Ti before the position control cycle clock time, see
"Actual value latch time" table, in chapter Technical data (Page 163). This behavior is similar
to that of PROFIBUS DP encoders.
64
Operating Instructions, 11/2016, A5E33441428B
SIMOTION C