S20-SSI-AO-1/1 Bosch Rexroth Indramat
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MPN: R911172544
The Bosch Rexroth Indramat S20-SSI-AO-1/1 is part of the S20 IndraControl Modules series and features a shielded twisted pair analog cable type with a short connector style. This module has a contact load of 8 A, measures 126.1 mm in height, 54 mm in depth, and 35 mm in width, and utilizes a Type 7 housing.
Internal Product Review
The S20-SSI-AO-1/1 is an S20 IndraControl module with an encoder/analog supply interface and a short connector style, well suited for clean control-cabinet integration. Shielded twisted pair analog cabling and last-value-held bus-failure behavior support stable signal handling and controlled process response. A strong choice for dependable machine I/O, especially with 0 V/0 mA output on Ua failure.
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Product Description:
The S20-SSI-AO-1/1 is an analog output module produced by Bosch Rexroth Indramat for integration within the S20 IndraControl Modules series. Designed for mounting on an IndraControl S20 I/O station, the module converts process data from the controller into standardized voltage or current signals for field devices such as valve positioners or transducers. Within an automation cell, it provides a single analog output channel and a dedicated synchronous serial interface, allowing deterministic updates in distributed architectures.
The module routes its analog channel through shielded twisted-pair cabling, which minimizes electromagnetic pickup on low-level process signals. Field connections are made through the S20 family’s short plug-in terminals, and each contact can carry up to 8 A, permitting the same connector to distribute sensor power where required. The electronics sit in a housing that is only 54 mm deep and 126.1 mm high, so the device fits within shallow enclosures. Across the rail, it occupies 35 mm of width, leaving space for adjacent modules, while the single terminal field provides straightforward wiring for one analog output. When bus communication is lost, the configurable fail-safe mode supports holding the last value, allowing the channel to retain its previous output. In contrast, a local supply fault drives the output to 0 V/0 mA to prevent unintended actuator motion.
The plastic enclosure follows the S20 mechanical profile identified as Type 7, providing consistent clearances and grounding surfaces with adjacent modules. Screw terminals accept conductors up to 1.5 mm², and the recommended stripping length of 8 mm ensures that clamping pressure is applied directly to the copper strands. Two separate supply rails provide the encoder supply and analog supply for the logic and output stage, isolating load transients from encoder reference voltages. The predictable wiring arrangement helps organize conductors within the enclosure. The short connector can also be removed without disturbing adjacent S20 modules during maintenance.
