7 SSI Input Units
7 - 16
NX-series Position Interface Units User’s Manual (W524)
You can find the clock period from the Baud Rate parameter in the SSI Input Unit as shown in the fol-
lowing table.
Each Unit has its own processing time, as shown in the following table.
The Unit processing time varies as shown in the above table according to the length of the data refresh
period and the processing status of the SSI Input Unit.
If the Wait Time for Receive Enabled parameter is set, SSI communications processing is started again
at the next synchronization cycle after the value set for the Wait Time for Receive Enabled parameter
elapses from when the data is refreshed.
The following are SSI Input Unit setting parameters: Baud Rate, Wait Time for Receive Enabled, Mono-
flop Time, Conversion Wait Time, Valid Data Length, and Leading Bits.
Refer to 7-9-2 SSI Data Settings on page 7-40 and 7-9-5 Bit Shifting on page 7-51 for details.
Precautions for Correct Use
If you use a Position Interface Unit and EtherCAT Coupler Unit together and you use Free-Run
refreshing, set the task period to a value that is greater than or equal to the refresh cycle of the
Position Interface Unit.
The refresh cycle is always 125 μs for unit version 1.2 or later.
The refresh cycle is always 250 μs for unit version 1.1 or earlier.
Baud rate setting Clock period (μs)
0: 100 kHz 10
1: 200 kHz 5
2: 300 kHz 3.3
3: 400 kHz 2.5
4: 500 kHz 2
5: 1.0 MHz 1
6: 1.5 MHz 0.67
7: 2.0 MHz 0.5
Model Unit processing time
NX-ECS112 36 to 146 μs
NX-ECS212 36 to 254 μs
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