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The Modbus master I/O interface allows connecting to various Modbus slaves and send read/write commands. The interface can operate over TCP/IP using an Ethernet physical link or over RTU using a serial link (RS232/RS485). Using a standard network interface card, the Modbus TCP protocol can be easily and rapidly integrated into any simulation model. With the proper user configuration, a driver is initialized on the target simulator at the start of the simulation and connects with all configured slave devices to begin data transmission.
Modbus is a data communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices. It is widely used for Industrial Automation and Energy system applications.

Platform Compatibility

Product Selection Guide

Modbus TCP, RTU or ASCII require software license OP3262, which comes with 50 data points (Visit this website more information on data points). If additional data points are required, then they may be added via product OP3050. 

Modbus TCP

Modbus TCP can be added to real-time simulators without the need of additional hardware. However, since real-time simulators come with at least one available ethernet port, if additional physical ethernet ports are required on the real-time simulator, these can be added via kit. Note that for applications requiring many ethernet ports, the OP4510 platform is not recommended.

Modbus RTU

For Modbus RTU, applications requiring RS-232 are supported natively by real-time simulators with one serial port. If RS-485 or additional RS-232 ports are required, then a  BLG-series Bluestorm PCI module must be added to the system. Due to the form factor of the Bluestorm modules, they are only compatible with OP5600, OP5700 and OP5000-series simulators. Hence for applications requiring RS-485 or multiple RS-232 ports, the OP4500-series platform is not recommended.

Modbus ASCII

Modbus ASCII applications require the use of an external gateway (EKI-1221-CE) to convert Modbus TCP to Modbus ASCII.

TypeProduct Number(s)OptionalDescriptionSimulator CompatibilityAdditional requirement(s)

License for Driver - Modbus Master communication protocol using TCP-IP, RTU or ASCII interfaces - 50 data points included. Additional data points may be added with the OP3050 product.





License for additional I/O data points for Ethernet-based communication protocols. 1000, 5000 or 30000 (unlimited) data points may be added.

Add-on moduleOP3821

Dual-port PCI-E X1 Gigabit Ethernet Kit for OP4510 Real-Time Simulators. Can be added if more physical ethernet ports are required for Modbus TCP.

OP4510 requires its PCIe slot to be available
Add-on moduleI350T4V2BLK

Intel I350T4V2 Quad Port Ethernet Server Adapter 10/100/1000 Mbps. Can be added if more physical ethernet ports are required for Modbus TCP. 

Open PCIe slot required
Add-on moduleBLG039-03

BlueStorm PCI 8 ports RS422/485, surge suppression, External DB-9 I/O Box. Can be used for Modbus RTU over RS-485.

Open PCI slot required
Add-on moduleBLG043-01

BlueStorm PCI, 4 ports RS232 and 4 ports RS422/485, with DB9 cable. Can be used for Modbus RTU over RS232 and/or RS485.

Open PCI slot required
Add-on moduleBLG006-01

BlueStorm PCIe 16 ports RS232/422/485. Bidirectional data speeds up to 1.8432 Mbps (RS-422/485). Hardware selectable RS-232/422/485. Default configuration: 16 ports RS-232. Any other configuration must be requested by the customer as it requires jumper settings before installing the board in the system. FCC certified and CE marked

Can be used for Modbus RTU over RS232 and/or RS485.

Open PCI slot required
Add-on moduleBLG005-01

BlueStorm PCIe 8 ports RS-232/422/485, surge suppression, External DB-9 I/O Box

Open PCI slot required
External hardwareEKI-1221-CE

 for Modbus ACII

Modbus Gateway 1-port - Use to convert Modbus between ASCII and TCP modes.

- Provides 2 x 10/100 Mbps Ethernet ports for LAN redundancy
- Integration of Modbus TCP and Modbus RTU/ASCII networks
- Supports up to 921.6 kbps, and any baud rate setting support up to 16 connections on each serial port under Modbus - Master mode and 32 sessions under Modbus Slave mode.
- Software selectable RS-232/422/485 communication

Requires OP3262
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