schmersal PSC1 Series Installation Manual page 109

Installation manual
Attention:
The encoder connections are not allowed to be connected or disconnected in operation. Electrical
components on the encoder may be irreparably damaged.
Disconnect from the electrical supply the encoders connected and the PSC1 module before connecting
or disconnecting the encoder connections. For externally supplied encoders, pay attention to shutting
down the external supply voltage (e.g. converter)
Twisted pairs according to the RS485 standard are to be used for signal transmission for the data and
clock signals or track A and track B. On the selection of the cross-section of the wire, the current
consumption of the encoder and the cable length in the installation in the specific case are to be
considered.
On the usage of absolute encoders, the following also applies:
In the slave mode, the clock signal is generated by an external process and is read with the data signal
from the PSC1 module. Due to this type of sampling there is a beat and consequently a sampling error
of the following order of magnitude:
F = (encoder sampling time, external system [ms] / 8 [ms]) * 100 %
The magnitude of the sampling error produced F must be considered on defining the thresholds on the
monitoring functions used, as this error cannot be compensated!
PSC1-C-10 Installation manual V2.7 Page 109 of 174
Version: 57E