Schneider IBS801 ICT Interbus-S Module

This module interfaces Schneider PLC systems with Interbus-S fieldbus networks. It manages high-speed data exchange between the controller and remote I/O devices. Therefore, it enables distributed automation architecture for large industrial applications.

Physical and Power Specifications

The Schneider IBS801 measures 13.5 cm in length and 10.0 cm in width. Moreover, its module weight equals approximately 0.28 kg for rack mounting. A single 9-pin D-sub connector provides the Interbus-S network interface. Additionally, this module includes status LEDs for network diagnostics.

Parameter	Specification
Brand	Schneider Electric
Full Model	IBS801
Category	ICT Interbus-S Module
Dimensions (L x W x H)	13.5 cm x 10.0 cm x 6.0 cm (5.31″ x 3.94″ x 2.36″)
Module Weight	0.28 kg (0.62 lbs)
Primary Interface	1 x 9-pin D-Sub Female (Interbus-S)
Backplane Interface	Premium PLC Rack (48-pin Connector)
Network Protocol	Interbus-S (Remote Bus)
Transmission Rate	500 kbps or 2 Mbps (Selectable)
Bus Topology	Ring (Closed Loop)
Maximum Cable Length	400 meters (1312 feet) per Segment at 500 kbps
Maximum Cable Length	100 meters (328 feet) per Segment at 2 Mbps
Maximum Devices per Network	256 (with Repeaters)
Maximum I/O Data	1024 Bytes Input + 1024 Bytes Output
Communication Type	Cyclic (PCP) + Acyclic (PCI)
Scan Time	2 ms for 128 Bytes of I/O Data
Bus Interface	RS-485 (Differential)
Bus Termination	External Terminator Required (Two Ends)
On-Board Components	1 Interbus-S ASIC + 1 Isolated Transceiver + 1 Oscillator (16 MHz) + 2 Optocouplers + 4 Protection Diodes + 1 Voltage Regulator
Memory Resources	64 kB Dual-Port RAM + 16 kB Flash
Energy Storage	2 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V)
Operating Voltage	+5 VDC from Backplane (0.35 A Typical)
Power Consumption	1.75 W (Typical)
Isolation Rating	1500 Vrms (Bus Port to Backplane)
Operating Temperature	0°C to +55°C (32°F to 131°F)
Mounting Type	Premium PLC Rack (Single Slot)
Status Indicators	1 Green LED (Power) + 1 Green LED (Bus Active) + 1 Yellow LED (Bus BA) + 1 Red LED (Fault)

Network Features and Bus Performance

The Schneider IBS801 functions as an Interbus-S remote bus master or slave. Specifically, the ring topology ensures deterministic data transmission for critical I/O. In addition, the transmission rate of 2 Mbps suits high-speed automation applications. Moreover, this module handles up to 1024 bytes of input and output data cyclically. Consequently, it provides fast and reliable communication for distributed I/O networks.

Energy Storage and Bus Stability

This module stores energy using four onboard capacitors for power filtering. Specifically, two electrolytic capacitors smooth the 5 VDC supply for stable ASIC operation. In addition, two tantalum capacitors provide high-frequency noise suppression for the transceiver. Furthermore, these capacitors maintain network communication during brief power interruptions. Therefore, the Schneider IBS801 ensures uninterrupted data exchange on the Interbus-S ring.

Configuration and Diagnostic Features

You will find four LED indicators on the module’s front panel for diagnostics. First, a green Power LED lights when the 5 VDC backplane supply is present. Second, a green Bus Active LED flashes during normal network communication. Third, a yellow Bus BA LED indicates bus arbitration or configuration status. Finally, a red Fault LED signals hardware errors or bus cable breaks. Thus, you can diagnose network issues instantly without external tools.

Installation and Network Wiring

This module requires external bus termination at both ends of the Interbus-S ring. For instance, you must install active terminators on the first and last devices. In addition, use shielded twisted-pair cables for the remote bus connection. Moreover, the 9-pin D-sub connector accepts standard Interbus-S pin assignments. Therefore, this module integrates seamlessly into existing Interbus-S installations.