Product Introduction and System Integration

The ProSoft ILX56-PBS is designed for ControlLogix installations that need to participate in a PROFIBUS network as multiple slave devices. Rather than requiring a separate communication gateway for each logical node, the module allows one ControlLogix chassis module to represent up to 10 PROFIBUS slave addresses.

On the ControlLogix side, the module exchanges data with the processor through the 1756 backplane. On the network side, it communicates with the external PROFIBUS master through its isolated RS-485 interface. This arrangement provides a structured data path between the two automation platforms.

The module supports cyclic process data exchange and selected DPV1 services, allowing the external master to access mapped controller data as well as supported alarm information. Its configuration tools also provide diagnostic capabilities that help engineers investigate network communication and data mapping issues.

During commissioning, each emulated slave should be assigned the correct PROFIBUS address and configured with the expected input/output data structure. The GSD file and master-side hardware configuration must match the module's settings. Baud rate, bus termination, and data mapping should also be verified before the system enters normal operation.

For facilities that need to integrate ControlLogix equipment into an established PROFIBUS master network, the ILX56-PBS offers a compact and flexible communication interface.

Technical Specifications

Parameter	Description
Brand	ProSoft Technology
Model	ILX56-PBS
Product Type	PROFIBUS DP Multi-Slave Communication Module
Platform	Rockwell Automation ControlLogix
Backplane Compatibility	1756 ControlLogix
Installation	Single-slot module
Communication Protocol	PROFIBUS DPV0 / DPV1
Operating Mode	Multi-Slave
Maximum Emulated Slaves	10
Maximum Data per Slave	244 bytes input / 244 bytes output
Maximum Aggregate Input Data	2,440 bytes
Maximum Aggregate Output Data	2,440 bytes
DPV1 Services	Class 1 Read/Write, Class 1 Alarm
Communication Interface	Isolated RS-485
Network Connector	Female DB9
Supported Baud Rates	9.6 kbps to 12 Mbps
Baud Rate Detection	Automatic
Configuration Software	PLX50 Configuration Utility
Backplane Current Load	450 mA at 5 VDC; 2 mA at 24 VDC
Enclosure Rating	IP20, NEMA/UL Open Type
Operating Temperature	-20°C to 70°C
Relative Humidity	5% to 95%, non-condensing
Dimensions	54.61 x 35.05 x 179.07 mm
Weight	0.454 kg / 1.00 lb

Recommended Related Models

Model	Product Description
ILX56-PBM	ProSoft PROFIBUS DP Master/Multi-Slave Communication Module
MVI56-PDPS	ProSoft PROFIBUS DP Slave Communication Module for ControlLogix
MVI56-PDPMV1	ProSoft PROFIBUS DPV1 Master Communication Module for ControlLogix
MVI56-PBM	ProSoft PROFIBUS DP Master Communication Module for ControlLogix

Popular Related Models

Model	Product Description
MVI56-MCM	ProSoft Modbus Communication Module for ControlLogix
MVI56E-MNET	ProSoft Modbus TCP/IP Communication Module
MVI56-DFCM	ProSoft DF1 Communication Module for ControlLogix
1756-EN2T	Allen Bradley ControlLogix EtherNet/IP Communication Module
1756-EN2TR	Allen Bradley ControlLogix EtherNet/IP Communication Module
1756-L83E	Allen Bradley ControlLogix Programmable Automation Controller
1756-PA72	Allen Bradley ControlLogix AC Power Supply

Applications

The ILX56-PBS is particularly useful when a ControlLogix system needs to appear as one or more PROFIBUS slave devices to an external controller.

PLC-to-PLC Communication: Allows an external PROFIBUS master to exchange data with a ControlLogix processor.
Legacy System Integration: Connects ControlLogix platforms to established PROFIBUS networks without replacing the existing master system.
Distributed Control: Transfers process values and status information between different automation platforms.
Machine Integration: Provides a communication link between ControlLogix controllers and PROFIBUS-based machine controllers.
Process Data Exchange: Supports cyclic transfer of operating values, commands, and equipment status.
Diagnostic Communication: Makes alarm and diagnostic information available to the PROFIBUS master through supported DPV1 services.

Advantages and Key Features

Multi-Slave Emulation

The module can emulate up to 10 independent PROFIBUS slave devices. This allows a single ControlLogix module to represent multiple logical nodes on the network.

High-Capacity Cyclic Data Transfer

It supports up to 244 bytes of input and output data per emulated slave, with an aggregate maximum of 2,440 bytes in each direction. This capacity supports applications involving multiple data groups and remote control interfaces.

DPV0 and DPV1 Communication

DPV0 provides cyclic process data exchange, while DPV1 adds acyclic Class 1 read/write services and alarm handling. These functions allow the external master to access more than basic I/O data.

Isolated RS-485 Interface

The PROFIBUS interface uses electrically isolated RS-485 communication, helping reduce the effects of electrical interference and ground-potential differences in industrial installations.

Automatic Baud Rate Detection

The module supports PROFIBUS transmission speeds from 9.6 kbps to 12 Mbps, including automatic baud rate detection. This simplifies integration with networks operating at different speeds.

Configuration and Diagnostic Tools

The PLX50 Configuration Utility provides configuration and diagnostic functions, including PROFIBUS packet capture. Custom Add-On Routines and Logix data mapping tools help streamline integration with ControlLogix applications.

Technical FAQs

Q1: What is the primary function of the ILX56-PBS?

The ILX56-PBS enables a ControlLogix processor to communicate with a PROFIBUS DP Master by emulating multiple PROFIBUS slave devices. It transfers process data between the ControlLogix backplane and the PROFIBUS network.

Q2: How many PROFIBUS slave devices can the module emulate?

It can emulate up to 10 individual PROFIBUS slave devices. Each emulated node is configured separately within the module's communication setup.

Q3: What is the maximum data capacity of the ILX56-PBS?

Each emulated slave supports up to 244 bytes of input data and 244 bytes of output data. Across all 10 emulated slaves, the maximum aggregate capacity is 2,440 bytes in each direction.

Q4: Does the module support DPV1 communication?

Yes. It supports DPV0 cyclic data exchange and DPV1 Class 1 read/write services and alarm handling in Slave mode.

Q5: Which PROFIBUS baud rates are supported?

Supported rates include 9.6, 19.2, 45.45, 93.75, 187.5, and 500 kbps, as well as 1.5, 3, 6, and 12 Mbps. Automatic baud rate detection is also supported.

Q6: Can each emulated slave have its own configuration?

Yes. Each logical slave can be configured with its own PROFIBUS address and data mapping. The configuration must match the device definition and data arrangement expected by the external PROFIBUS master.

Q7: Which connector is used for the PROFIBUS network?

The module uses a female DB9 connector for its isolated RS-485 PROFIBUS interface. Use suitable PROFIBUS cable and connectors, with correct bus termination at the physical network endpoints.

Q8: What software is used to configure the ILX56-PBS?

The module is configured using the PLX50 Configuration Utility. The software supports module setup, slave configuration, data mapping, and diagnostic operations.

Q9: What should be checked if the PROFIBUS master cannot communicate with the module?

Check the baud rate, slave addresses, GSD configuration, bus termination, cable shielding, connector wiring, and master-side I/O configuration. Also inspect the module status and use the packet capture utility to investigate communication traffic.

Q10: Can the ILX56-PBS replace the ILX56-PBM directly?

No. The ILX56-PBS is intended for Multi-Slave operation, while the ILX56-PBM provides PROFIBUS Master and Multi-Slave functionality. Although they share the same product family, their communication roles differ. Confirm the required operating mode and project configuration before selecting a replacement.

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