Honeywell 2MLL-C42B MasterLogic-200 RS-422 Serial Communication Module
The Honeywell 2MLL-C42B is a dual-channel serial communication module designed for the MasterLogic-200 PLC system. Operating as a dedicated Snet interface, it provides asynchronous serial data exchange between PLC controllers and external industrial field devices, including drives, instrumentation, and supervisory systems.
Channel Configuration and Communication Performance
The module features two independent RS-422 serial channels supporting asynchronous communication at transmission speeds from 300 bps to 115,200 bps. It accommodates point-to-point (1:1), multidrop (1:N), and multi-master (N:M) network topologies across distances up to 500 meters. Up to 32 stations (station numbers 0-31) can be addressed across the network segment.
Protocol Support and System Diagnostics
Programmable via SoftMaster-NM software, the 2MLL-C42B supports Modbus RTU/ASCII, peer-to-peer (P2P), and user-defined custom protocols. Data framing options include selectable data bits (7 or 8), stop bits (1 or 2), and parity checking (odd, even, or none). Front-panel LEDs for RUN, I/F, TX, RX, and ERR deliver real-time diagnostic status alongside integrated loopback and frame monitoring functions.
| Parameter | Specification |
|---|---|
| Model Number | 2MLL-C42B |
| Manufacturer | Honeywell |
| Product Series | MasterLogic-200 |
| Product Type | Serial Communication Module (Snet Interface) |
| Number of Channels | 2 |
| Physical Interface | RS-422 |
| Communication Mode | Asynchronous Serial |
| Baud Rate | 300 to 115,200 bps |
| Maximum Distance | 500 m |
| Network Topology | 1:1, 1:N, N:M |
| Maximum Stations | 32 (Station range: 0-31) |
| Supported Protocols | Modbus RTU, Modbus ASCII, P2P, User-Defined |
| Data Framing | 7/8 Data Bits, 1/2 Stop Bits, Odd/Even/None Parity |
| Configuration Software | SoftMaster-NM |
| Status Indicators | RUN, I/F, TX, RX, ERR |
| Rack Installation | MasterLogic-200 PLC Rack |
Frequently Asked Questions
Q: What is the primary function of the 2MLL-C42B module in a MasterLogic-200 system? A: It provides two RS-422 asynchronous serial communication channels to connect the PLC with external field devices, SCADA systems, or third-party controllers.
Q: What protocols can be configured on the 2MLL-C42B serial module? A: It supports Modbus RTU/ASCII, peer-to-peer (P2P) communication, and user-defined protocols configured using SoftMaster-NM software.
Q: What is the maximum transmission distance for the RS-422 interfaces? A: The RS-422 channels support a maximum transmission distance of up to 500 meters.
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