Product Short Description
Product Name: Hollysys FM020 Profibus-DP ↔ Modbus Communication Gateway Module
Product Introduction: The FM020 is a communication interface module for Hollysys HOLLiAS MACS-FM DCS series. It functions as a protocol conversion gateway, bridging Profibus-DP (slave) and Modbus RTU/ASCII (master or slave), enabling third-party Modbus devices such as variable frequency drives, instruments, and PLCs to be integrated into the MACS-F DCS system. The module is available in versions FM020-A01 (legacy) and FM020-A02 (new version, compatible with A01).
Description
Technical Specifications:
- Model: FM020-A01 / FM020-A02
- Brand: Hollysys
- System: HOLLiAS MACS-F / FM series DCS
- Core function: Profibus-DP ↔ Modbus RTU/ASCII protocol conversion
- DP side: Profibus-DP slave (fixed role), connected to DCS master
- Modbus side: Master or Slave (configurable)
- DP baud rate: 500 kbps (MACS-F default)
- Modbus physical layer: RS-485 (default, max 1200 m) / RS-232 (max 15 m)
- Modbus baud rate: 1200 – 115.2 kbps, default 9600
- Modbus mode: RTU / ASCII
- Modbus function codes: 01, 02, 03, 04, 05, 06, 0F, 10
- Max Modbus slaves (as master): 18 (some listings state up to 22)
- DP address range: 1–126 via DIP switch
- Data capacity: DP side input/output ≤ 1000 bytes each, total ≤ 1200 bytes
- Power supply: 24 Vdc (via FM rack backplane)
- Mounting: FM rack slot + FM131A/FM131-E-A base, 35 mm DIN rail, hot-swappable
- Operating temperature: 0°C to 45°C (cabinet installation)
- Compatible GSD files: FM020-Master.GSD / FM020-Slave.GSD
Functional Features:
- Dual-role Modbus side (master/slave configurable)
- Protocol data exchange and address mapping in RAM
- Redundant configuration support (dual FM020 with different DP addresses)
- Photoelectric isolation on communication ports for anti-interference
- Front-panel LEDs: RUN (green), COM (yellow), TXD/RXD (yellow) for diagnostics
- DIP switches for DP address and termination resistor (TR) control
Application Scenarios: Integrating third-party Modbus instruments, variable frequency drives, and PLCs into Hollysys MACS-F DCS; connecting intelligent meters and field devices to DCS via Profibus-DP; serving as a standard fieldbus interconnection gateway.
Installation Requirements: Install in an FM rack slot with FM131A or FM131-E-A base on a 35 mm DIN rail. Set the DP address via the 8-bit DIP switch (1–125). Enable the termination resistor (DP TR / Modbus TR) only at the bus ends. Connect the DP bus to DPA/DPB terminals and Modbus field devices to RS-485/RS-232 terminals.
Usage Precautions: The DP side is a fixed slave — it cannot act as a DP master. Termination resistors must be ON only at bus endpoints, OFF in the middle. Verify GSD file compatibility with the DCS version. For redundant configurations, both FM020 modules must have identical parameters except for DP address.
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