SR3MBU01BD

Configured for Modbus serial communication execution in Zelio Logic SR3 relay networks, the Schneider Electric SR3MBU01BD (SR3MBU01BD Modbus slave communication module) provides direct physical/electrical execution for remote monitoring and control data exchange through RS485 interface.

Hardware Specifications

Parameter	Specification
Model	SR3MBU01BD
Brand	Schneider Electric
Series	Zelio Logic SR3
Product Type	Modbus Slave Communication Module
Communication Protocol	Modbus RTU / ASCII
Communication Interface	RS485 via RJ45 connector
Supply Voltage	24 VDC
Wiring Mode	2 or 4 wires
Transmission Rate	1200, 2400, 4800, 9600, 19200, 28800, 38400, 57600 bauds
Modbus Address Range	1 to 247
Programming Language Support	FBD, Ladder
EEPROM Backup Memory	Data retention up to 10 years
Electrical Connection	1 RJ45 connector
Terminal Connection	Screw terminals, 0.25 to 2.5 mm2
Tightening Torque	0.5 N.m
Local Indication	Communication LED, Power ON LED
Weight	0.11 kg
Dimensions	60 mm x 65 mm x 110 mm
Operating Temp	-20 to 55 deg C
Storage Temp	-40 to 70 deg C
Power Consumption	24 VDC supply input, module current not specified

EtherNet/IP and Modbus Communication Interface

The SR3MBU01BD adds Modbus slave communication capability to Zelio Logic SR3 smart relays through RS485 serial communication. The module supports RTU and ASCII transmission frames with configurable parity settings including none, odd, and even. The communication address range allows integration of multiple slave devices within a Modbus network structure.

The RS485 electrical layer requires controlled wiring practices, including separation from high-voltage conductors and proper cable shielding for communication stability. The RJ45 communication connector provides the physical interface between the Zelio Logic relay and external Modbus master devices.

Firmware and Memory Data Handling

The module incorporates EEPROM flash memory for application data backup. The stored data can be recovered after power interruption events. The SR3MBU01BD is compatible with Zelio Logic SR3 BxxxBD modules supplied by 24 VDC.

The Zelio Logic platform supports FBD and Ladder programming through Zelio Soft software. The communication module transfers relay status and control information through Modbus registers for remote access functions.

Frequently Asked Questions

Q: What communication protocol is supported by the SR3MBU01BD module?
A: The module supports Modbus RTU and ASCII communication frames through an RS485 communication port.

Q: What Zelio Logic modules are compatible with the SR3MBU01BD?
A: The module is compatible with Zelio Logic SR3 BxxxBD modules using a 24 VDC supply.

Q: Does the module provide local hardware status indication?
A: The module includes one communication LED and one power ON LED for local status monitoring.

Field Installation Guidelines

Install the SR3MBU01BD on a compatible Zelio Logic SR3 relay assembly using the specified terminal connections. Route RS485 communication wiring separately from power conductors and high-noise switching circuits.

Use shielded communication cable where required by the installation environment. Connect cable shielding according to site grounding practices to reduce electromagnetic interference.

Verify the 24 VDC supply polarity before energizing the module. Confirm Modbus address, baud rate, parity configuration, and communication frame settings before connecting the device to the control network.

---