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InterBus-S Slave

InterBus-S, an open sensor/actuator bus system, is an especially fast and deterministic communication protocol for automation of production and processing sensors and actuators. InterBus-S is configured as a serial data ring, called the remote bus, controlled by a master module. Branch data rings, called local bus, can be connected to the remote bus by bus terminal modules. I/O can be connected to both the remote and local bus.

The Niobrara IBSS was designed to allow a SY/MAX® processor to share input values and obtain control information from an InterBus-S network. The speed of the InterBus-S network provides for some of the fastest communication possible to a SY/MAX processor, usually limited by the processor's scan time and not by the InterBus-S cycle time.

The IBSS performs the function of Remote Bus Slave (with I/O) on an InterBus-S network. It is intended for use in a SY/MAX register rack, where it operates on 5 volts supplied by the bus and communicates with a SY/MAX PLC through the rack interface. While the IBSS can be used in either a main or remote register rack, it is not a SY/MAX bus master; an IBSM and an IBSS cannot be substituted for an LI/RI pair to create a remote rack.

Communication with the InterBus network is through isolated RS-485 InterBus-S remote bus connectors located on the front panel of the module. These connectors conform to InterBus-S standard 9-pin remote bus pinout allowing the use of standard remote bus cabling, such as Niobrara's IR9D.

All data is stored in the IBSS as standard SY/MAX registers. The IBSS provides 4 words each of InterBus-S outputs and inputs in 10 rack-addressable registers. The first 4 SY/MAX registers are the InterBus-S outputs (PLC inputs). The fifth register reports the status of the IBSS as a PLC input. The sixth through ninth registers are the InterBus-S inputs (PLC outputs). The tenth register is a reserved command register currently not used. If more than four input or output registers are needed, multiple IBSS modules can be used in a single rack.

The InterBus-S master on the network requires the identity and width of each device on the network; the IBSS ID is 03 and the width is 4 words. The IBSS can be placed anywhere on an InterBus-S remote bus network, downstream from the master, including placement as the last device in the network. An external isolated 24 VDC power supply may be used to provide uninterrupted InterBus-S operation should the SY/MAX equipment be removed from service. A plug for connection to an external power supply is provided on the front panel of the IBSS.

The IBSS is furnished with a user manual and carries a one year warranty. See Niobrara's Standard Terms and Conditions of Sale for additional Warranty information.


Dimensions: Standard SY/MAX register module. 1.5" wide by 13" tall by 6.5" deep. Approximately four pounds net. Rugged welded steel enclosure with baked on finish. All connectors and indicators are front mounted except the SY/MAX bus card edge connector on the back.

Power Requirements: 5 Volts, 400mA (from SY/MAX bus) or 24 VDC, 150mA external power supply.

InterBus-S Ports: 9-pin female D-subminiature connector (Remote Bus Out). 9-pin male D-subminiature connector (Remote Bus In). For use with three twisted pair, InterBus-S Remote Bus standard cabling. Optically isolated.

Indicators: Front panel LED indicators for Rack Power, External Power, Remote Bus Connection, Remote Bus Active, and Error. Five total indicators.

PLC Interface: 10 Registers; 4 inputs, status, 4 outputs, and command registers.

InterBus-S Interface: Four input words; four output words. ID 03; width 4.


The IBSS is available as:

IBSS with Remote Bus In and Remote Bus Out ports.

Effective 15 June 1996 - Specifications subject to change without notice.