The Allen-Bradley 1734-SSI is a POINT I/O module that is manufactured by Allen-Bradley. This module is a motion or positioning control module, interfacing with absolute encoders via Serial Synchronous Interface (SSI) protocol. This module is a modular assembly that is composed of a terminal base and a Removable Terminal Block (RTB). The 1734-SSI Serial Synchronous Interface (SSI) module comes with a single channel of SSI interface and specifically supports any absolute encoder supporting standard SSI protocol including linear, rotary, and optical distance measuring devices. It supports Most Significant Bit (MSB) aligned data format with the RS422 physical interface. It is used with a wiring base assembly with catalog number 1734-TB, 1734-TBS with key switch positioned at number 2. This module has a POINTBus current draw of 110 mA at 5VDC with a Power dissipation of 0.94 Watts with a continuous voltage isolation rating of 50 V, able to withstand 1250V for a duration of 60 seconds. The 1734-SSI has physical measurements of 56.0 (H) x 12.0 (W) x 75.5 (L) mm (2.21 (H) x 0.47 (W) x 2.97 (L) in). The module has software selectable SSI data rate of 125 kHz, 250 kHz, 500 kHz, 1 MHz, and 2 MHz; SSI bits per word of 2-31, Word Delay time of 16 µs…64 ms and maximum Word length of 3 bits or 4 bytes. The module's SSI protocol is capable of Gray or binary code with gray to binary conversion, increasing or decreasing SSI count indication, Two (2) SSI word comparator values, and SSI word latching with I1 input. The SSI positioning time is ) > 0.5 ms.

The 1734-SSI Synchronous Serial Interface Module by Allen-Bradley is an electronic module, which collects data from a positioning encoder sensor, which uses the SSI protocol. The 1734-SSI is a single-channel module with a Point BUS current of 110mA and dissipates 0.94W power across the module. It has 4 terminally-based units and 2 key-switch positions. The 1734-SSI requires an external DC voltage supply rated between 10 and 28.8V DC and an isolation voltage of 50V across the field side and system. The 1734-SSI has a 4-Byte (32-bit) word length, and a data rate of 125 kHz, 250 kHz, 500 kHz, 1 MHz, and 2 MHz depending on the software preference at 2-31 bits per word (also software preference). This SSI Module has a Key Switch Position of 2. The 1734-SSI module collects serial data from industrial absolute-position encoding sensors that use a standard SSI protocol.

The 1734-SSI has a software preference word delay time between 16 µand 64ms. The 1734-SSI Synchronous Serial Interface Module has an ON-STATE current of 4mA at a 24V DC field voltage supply, which can also max out at 5mA. The OFF-STATE input voltage at the field supply voltage is 19V and it will max out at 24V and a current of 1.2mA. It has an input impedance of 3.6 kOhms; which also maxes out at 4.7 kOhms. The 1734-SSI cable type is UL CM/AWM certified, and the cable length ranges from 125 kHz at 320m (1050 feet) to 2 MHz at 8m (25 ft) depending on the SSI data rate desired by users. It has an operational temperature range of -20-55 deg. C (-4-131 deg. F) and a shipping or storage temperature between -40 and 85 deg. C (-40 and 185. Deg. F) at 5-95% non-condensing relative humidity. The 1734-SSI is built to withstand an operational shock of 30G, and an operational vibration of 5 g at 10-500 Hz, in an open-style enclosure.