ProSoft Technology ILX69-PBS CompactLogix PROFIBUS DPV1 Slave Module

Configured for high-speed cyclic and acyclic fieldbus communication in Allen-Bradley CompactLogix platforms, the ProSoft Technology ILX69-PBS (ILX69-PBS PROFIBUS DPV1 Slave Module) provides direct physical/electrical execution.

Hardware Specifications

Protocol Conversion Latencies & Bus Synchronization

The module bridges the local 1769 backplane bus and the RS-485 serial fieldbus via hardware-level buffer memory mapping. Protocol conversion latencies are maintained at minimal levels by decoupling the asynchronous 1769 backplane scanning cycle from the deterministic PROFIBUS DP transmission frame. The internal memory buffer allocates up to 244 bytes of input cyclic data and 244 bytes of output cyclic data, processing DPV1 acyclic messaging channels in parallel without interrupting cyclic DP-V0 process data exchanges.

Frequently Asked Questions

Q: Can the module be installed in a remote 1769 expansion rack across an expansion cable?

A: The module must observe the standard 1769 CompactLogix power supply distance rating. It must be installed within the specified number of slots from the 1769 power supply to ensure backplane 5 VDC voltage drop limits are not exceeded.

Q: How is network termination handled on the DB9 RS-485 interface at high baud rates?

A: The module relies on standard PROFIBUS DB9 connectors equipped with integrated active termination resistors. External termination switch positions must be verified on both physical end-nodes of the RS-485 segment, especially when operating at the maximum 12 Mbps threshold.

Field Installation Guidelines

• DIN-Rail Assembly and Grounding: Ensure the 1769 chassis DIN-rail panel is grounded to the main cabinet ground bus using a low-impedance copper braid. The module enclosure relies on metal-to-rail grounding contact tabs for electrostatic discharge (ESD) mitigation.
• RS-485 Cable Shielding: Terminate the PROFIBUS standard Type A shielded twisted-pair cable using metal-housed DB9 connectors with 360-degree shield compression clamps. Do not pig-tail the braid to avoid high-frequency noise insertion on the RS-485 signal lines.
• Rotary Switch Configuration: Set the physical node address switches prior to backplane power-up. If node address selection is assigned via software software tools, configure the rotary switches to position 00 or the designated software-override setting per system hardware standards.