Product Details

The ProSoft PLX31-PND-MBS is a standalone DIN-rail mounted protocol gateway for bidirectional cyclic and acyclic data exchange between PROFINET controllers and Modbus serial RTU or ASCII devices. It acts as a PROFINET Class A IO device on the PROFINET side, and the serial port can be configured as Modbus master or slave to connect power meters, flow transmitters, temperature controllers, variable frequency drives and other legacy serial instruments to Siemens PROFINET PLC systems. The serial interface supports software selection of RS232, RS422 and RS485, with adjustable baud rate from 110 baud to 115.2 kbps, parity, data bits and stop bits to match different field devices. It supports standard Modbus function codes and flexible floating-point data conversion including Enron and Daniel float formats, and up to 10000 16-bit registers are available for data mapping to meet large-volume data exchange requirements. The PROFINET channel supports real-time RT cyclic communication with 1440 bytes input and 1440 bytes output data capacity, suitable for most factory and process automation scenarios. It is equipped with an SD card slot for configuration backup and fast recovery during hardware replacement, which effectively reduces on-site downtime. Users complete data mapping, polling schedule and alarm configuration through ProSoft Configuration Builder software. The gateway runs independently of the PLC scan cycle, so protocol conversion and serial polling will not occupy controller resources or interfere with the original control logic. It provides comprehensive diagnostic tags for PROFINET connection status, serial message counters, timeout and fault codes, which can be read by the PROFINET controller and displayed on HMI or SCADA for fast troubleshooting. A conformal coated version is optional for humid, dusty and corrosive industrial environments. This model is widely used in new automation construction and legacy system upgrade projects in manufacturing, power, water treatment and oil & gas industries.

This gateway adopts rugged metal housing for DIN rail installation. It has one galvanically isolated 10/100Mbps shielded RJ45 Ethernet port and one terminal block serial port, and accepts 10VDC to 36VDC wide-range DC power supply with 24VDC nominal input. LED indicators display power status, module fault, Ethernet link, PROFINET connection and serial TX/RX activity for convenient on-site inspection. The operating temperature range is -25°C to 70°C, storage temperature ranges from -40°C to 80°C, relative humidity 5% to 95% non-condensing. It complies with IEC industrial shock, vibration and EMC standards, and has obtained PROFINET Class A certification. It supports remote configuration, online firmware upgrade and configuration backup for long-term field maintenance.

This PROFINET to Modbus serial gateway is widely applied in packaging machinery, automotive production lines, power distribution monitoring, water plant control and skid-mounted equipment automation projects. It seamlessly integrates traditional Modbus serial field instruments into the PROFINET control network, avoiding complicated communication programming inside the Siemens PLC. As a reliable protocol conversion spare part, the PLX31-PND-MBS retains original field instrument wiring and effectively reduces the renovation cost of multi-brand industrial control system integration.