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7 SSI Input Units
NX-series Position Interface Units User’s Manual (W524)
7-9 Functions
7
7-9-2 SSI Data Settings
The travel distance is calculated according to the direction of rotation.
The direction of rotation is determined to be in the Forward/reverse direction pulse based on where the
present value is in the range of ±resolution/2 of the previous value, as shown in the figure below.
The travel distance is considered positive if the direction of rotation is positive, and it is considered neg-
ative if the direction of rotation is negative.
The following table gives the meanings and default values of the parameter settings.
Changes to the following parameter settings are applied when the power supply to the NX Unit is turned
ON or the NX Unit is restarted.
Settings
Parameter name Setting Default Remarks
SSI Communications
Start-Up Time
0: 2,000 ms
1: 1,050 ms
2: 500 ms
3: No delay
0 Set this parameter to the wait time until SSI
communications are started from the time
that power is supplied to the SSI Encoder
Unit after the power supply is turned ON or
after the NX Unit is restarted.
Wait Time for Receive
Enabled
*1
0 to 9999 × 10 μs 0 Set the wait time until the next frame can be
received.
Monoflop Time 1 to 9999 × 10 μs 4 Set this parameter to the duration from
when the last clock is sent until the high
level is confirmed on the data line.
Conversion Wait Time 0 to 64 × Transmission clock
cycle
0 • Set the wait time from the falling edge of
the first clock signal to the rising edge.
• The wait time is the clock cycle multiplied
by the set value. A setting of 0 is equal to
a half of the clock cycle.
Baud Rate 0: 100 kHz
1: 200 kHz
2: 300 kHz
3: 400 kHz
4: 500 kHz
5: 1.0 MHz
6: 1.5 MHz
7: 2.0 MHz
4 Set the frequency of the transmission clock
signal for SSI communications.
Valid Data
Length
*2*3*4
1 to 32 (bits) 25 Set the valid bit length for SSI data.
Single-turn Data Start
Bit
*2
0 to 31 (bits) 12 Set the start bit position for single-turn data.
Single-turn Data
Length
*2*5
0 to 32 (bits) 13 Set the data length for single-turn data.
Previous position
Positive/negative direction pulse
Positive/negative direction pulse
0
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