ABB 07KP93 MODBUS RTU Communication Processor

Product Overview

The ABB 07KP93 (Product ID: GJR5253200R1161) is a communication processor module for the Advant Controller 31 (AC31) system. Equipped with 2 serial MODBUS RTU interfaces (COM3 and COM4), this module enables external devices to connect to the AC31 system using the industry-standard MODBUS RTU protocol. It is the ideal solution for integrating AC31 controllers into mixed-vendor automation environments or connecting to MODBUS-compatible HMIs, VFDs, and SCADA systems.

Key Specifications

• Manufacturer: ABB
• Product ID: GJR5253200R1161
• Product Family: Advant Controller 31 (AC31)
• Type: Communication Processor / Interface Module
• Serial Interfaces: 2 × MODBUS RTU (COM3, COM4)
• Interface Standards: EIA RS-232 or EIA RS-485 (configurable per interface)
• Operating Modes: Master/Slave, Slave/Master, Slave/Slave (Master/Master not supported)
• Power Supply: 24 V DC (via AC31 basic unit or external supply)
• Dimensions: ~16 cm × 16 cm × 10 cm
• Weight: ~0.58 kg
• Mounting: DIN rail or screw mounting
• Programming Software: 907 KP 93

Features & Benefits

• Dual MODBUS RTU Ports: Two independent serial interfaces allow simultaneous communication with multiple MODBUS networks or devices.
• Flexible Configuration: Each interface can be configured as RS-232 or RS-485, supporting both point-to-point and multi-drop network topologies.
• Master/Slave Flexibility: COM3 and COM4 can operate in Master/Slave, Slave/Master, or Slave/Slave modes — adapt to any network architecture.
• Seamless AC31 Integration: Communication with AC31 basic units is handled via function blocks and connection elements within the standard programming environment.
• Industrial Reliability: Electrical isolation between interfaces and the rest of the unit protects against ground loops and transient surges.

Typical Applications

• SCADA system integration for AC31 controllers
• Connecting ABB AC31 to third-party MODBUS devices (VFDs, power meters, sensors)
• Multi-vendor automation network bridges
• Remote monitoring and data acquisition (RMDA)
• Building management system (BMS) connectivity

Installation Guide

1. Mounting: Install the 07KP93 adjacent to the AC31 basic unit on a 35 mm DIN rail. The module connects to the basic unit via the networking interface (ribbon cable).
2. Power Supply: The module receives power from the AC31 basic unit. Loop the 24 V DC supply from the basic unit to the 07KP93 power terminals.
3. Serial Interface Wiring: Connect external MODBUS devices to COM3 and COM4. Use shielded twisted-pair cables for RS-485 networks. Maximum cable length depends on baud rate (typically up to 1200 m at 9600 bps).
4. Interface Configuration: Set each interface to RS-232 or RS-485 mode using internal jumpers or software configuration via 907 KP 93 programming tool.
5. Protocol Setup: Configure baud rate, parity, data bits, and stop bits to match the connected MODBUS devices. Define master/slave roles per interface.
6. Programming: Use 907 KP 93 software to create function blocks in the AC31 basic unit that exchange data with the 07KP93 module.
7. Testing: Verify communication using the diagnostic LEDs and MODBUS polling tools before placing the system in production.

FAQ

Q: What is the difference between 07KP93 and 07KP90?
A: The 07KP93 is a MODBUS RTU communication processor with 2 serial interfaces. The 07KP90 is an RCOM communication module for CS31 bus connectivity. The 07KP93 is protocol-specific (MODBUS), while the 07KP90 is for ABB's proprietary RCOM interface.

Q: Can both COM3 and COM4 operate as masters simultaneously?
A: No. The supported modes are Master/Slave, Slave/Master, and Slave/Slave. Master/Master configuration is not supported.

Q: What baud rates are supported?
A: Standard MODBUS RTU baud rates are supported, typically ranging from 1200 bps to 115200 bps. Confirm exact rates in the 907 KP 93 documentation.

Q: Is the 07KP93 compatible with all AC31 basic units?
A: The 07KP93 is compatible with most AC31 basic units including 07KT92, 07KT93, 07KT94, 07KT97, and 07KR91 (with appropriate networking interface). Verify firmware compatibility before installation.

Selection Tips

• Use 07KP93 when your application requires MODBUS RTU connectivity to SCADA, HMIs, or third-party devices.
• For custom serial protocols or more than 2 serial ports, consider the 07MK92 freely programmable communication module.
• Ensure proper termination resistors (120 Ω) on RS-485 networks to prevent signal reflections.
• Keep RS-485 cable shield grounded at one end only to avoid ground loop currents.
• When replacing a failed 07KP93, note the firmware version and configuration settings to ensure identical replacement behavior.