Overview
Configured for cyclic program execution and distributed I/O synchronization in AC500 controller systems, the ABB PM591-2ETH, also cataloged as the PM591-2ETH CPU Processor Module, provides deterministic scan-based logic processing with integrated Ethernet communication channels for AC500 PLC architectures. The CPU exchanges process image data with local and remote I/O stations through the system backplane during each execution cycle.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM591-2ETH |
| Brand | ABB |
| Origin | Not specified in provided documentation |
| Weight | Not specified in provided documentation |
| Dimensions | Not specified in provided documentation |
| Operating Temp | Not specified in provided documentation |
| Power Consumption | Not specified in provided documentation |
| CPU Type | AC500 programmable logic controller CPU |
| Ethernet Interfaces | 2 x integrated Ethernet ports |
| System Bus | AC500 backplane communication bus |
| Program Execution | Cyclic scan-based processing |
Deterministic Scan Control and Dual Ethernet Architecture
The PM591-2ETH executes control logic through a cyclic scan model in which input acquisition, program execution, and output refresh are processed in a fixed sequence. The CPU maintains synchronization with AC500 I/O modules through the internal backplane, ensuring consistent process image handling across distributed stations.
The dual Ethernet interface structure supports separation of control network traffic and engineering access. One interface is typically assigned to controller programming and diagnostics, while the second interface handles HMI communication or network segmentation tasks.
Backplane communication operates in coordination with CPU scan timing, enabling consistent I/O refresh cycles without external synchronization hardware. This architecture supports modular expansion of AC500 I/O systems without modifying core CPU execution behavior.
Frequently Asked Questions
Q: Does the PM591-2ETH require an external communication module for Ethernet access?
A: No. The CPU includes two integrated Ethernet ports for direct network connectivity.
Q: How is I/O data synchronized with the CPU?
A: I/O data is exchanged through the AC500 backplane and updated within each CPU scan cycle.
Q: Can both Ethernet ports be used simultaneously?
A: Yes. The two ports can be configured for separated network functions such as engineering access and process communication.
Field Installation Guidelines
Install the PM591-2ETH only in ABB AC500-compatible CPU base units. Ensure proper mechanical locking before applying system power. Separate Ethernet cabling from power conductors, motor feeders, and inverter output cables to reduce electromagnetic interference.
Maintain correct shielding termination at cabinet entry grounding points for industrial Ethernet lines. Verify port assignment and IP configuration prior to commissioning. Apply standard panel wiring torque specifications during termination. Perform network reachability and CPU status verification through engineering software before enabling process control execution.
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