Rockwell Automation 1734-SSI POINT I/O Synchronous Serial Interface Encoder Module Installation Instructions - Manual (Page 16)

16 POINT I/O Synchronous Serial Interface Absolute Encoder Module
Publication 1734-IN581D-EN-E - January 2014
Specifications
POINT I/O Synchronous Serial Interface Absolute Encoder Module –
1734-SSI, Series C
Attribute Value
Number of SSI channels 1
Encoder type Any absolute encoder supporting standard SSI protocol including linear,
rotary, and optical distance measuring devices
Most-Significant Bit Aligned data format
Physical interface for clock and data signals is RS-422
SSI data rate 125 kHz, 250 kHz, 500 kHz, 1 MHz, 2 MHz (software selectable)
SSI bits per word 2…31 (software selectable)
SSI word delay time (1) 16 μs…65535 μs (software selectable)
SSI word length 4 bytes (32 bits)
SSI features Gray or binary code capable with gray to binary conversion, increasing or
decreasing SSI count indication, 2 SSI word comparator values, SSI word
latching with I1 input
SSI position forming time (2) ≥0.5 ms
SSI cable type UL CM/AWM 2464/CSA Type CMG FT4 or similar cable utilizing shielded
twisted pairs for D+/- and C+/- connections. See sensor manufacturer for
actual cable required for the SSI sensor under use. I1 input can be
separate from SSI cable.
SSI cable length Depends on desired SSI data rate:
125 kHz – 320 m (1050 ft)
250 kHz – 160 m (525 ft)
500 kHz – 60 m (195 ft)
1 MHz – 20 m (65 ft)
2 MHz – 8 m (25 ft)
SSI sensor power 450 mA, 10…28.8V DC
SSI clock drive current
(Out of C+/- terminals), max
125 mA
Input I1 IEC Type 3 voltage and current characteristics, sourcing type
Minimum Nominal Maximum
ON-state voltage 0V DC - FPV* -10
ON-state current 2 mA 4 mA (FPV=24V DC) 5 mA
OFF-state voltage FPV-5 - FPV
OFF-state current 1.2 mA - -