PM857 AC 800M High Integrity Controller | ABB

PM857 AC 800M High Integrity Controller

The PM857 from ABB serves as a high-performance processor unit for the AC 800M controller family. This robust controller delivers both standard and safety-certified functionality for industrial automation applications. It combines process control with safety integrity levels up to SIL 3 when configured with appropriate safety modules.

Controller Architecture and Features

• Features MPC866 microprocessor with 96 MHz clock frequency
• Contains 32 MB RAM with 22.184 MB available for applications
• Includes real-time clock with lithium backup battery
• Supports high-integrity functionality with SM812 safety module
• Offers CompactFlash interface for firmware storage and updates

Technical Specifications

• Manufacturer: ABB
• Model Number: PM857 (Article 3BSE088385R1)
• Processor Type: MPC866 at 96 MHz
• Memory Capacity: 32 MB RAM, 18 MB Flash PROM
• Performance: 0.17 ms for 1000 boolean operations
• I/O Capacity: Maximum 128 I/O signals total
• Power Supply: 24 V DC (19.2-30 V DC range)
• Power Consumption: 210 mA typical, 360 mA maximum

Safety and Certification

• SIL 3 certified when used with SM812 safety module
• TÜV approved for safety instrumented systems
• ISA Secure certified for cybersecurity protection
• IEC 61508 compliant safety environment
• Enables combination of safety and process control in one unit

Communication Interfaces

• Two RJ45 Ethernet ports (CN1, CN2) for control network
• Two RS-232C serial ports (COM3, COM4) for configuration
• Supports MMS and IAC protocols over Ethernet
• 10 Mbit/s Ethernet speed with RJ-45 connectors
• Clock synchronization within 1 ms between controllers

System Capacity and Performance

• Supports up to 32 applications per controller
• Handles 64 programs and 128 diagrams per application
• Manages 32 tasks with 32 different cycle times
• Minimum cycle time of 10 ms for application programs
• Modulebus scan rate from 0 to 100 ms
• Switchover time under 10 ms in redundant configurations

Environmental Specifications

• Operating Temperature: +5 to +55 °C (+41 to +131 °F)
• Storage Temperature: -40 to +70 °C (-40 to +158 °F)
• Relative Humidity: 5 to 95% non-condensing
• Maximum Altitude: 2000 meters according to IEC/EN 61131-2
• Pollution Degree: Degree 2 per IEC/EN 61131-2
• Protection Rating: IP20 according to EN60529
• Vibration Resistance: Meets industrial vibration standards

Certifications and Compliance

• CE marked for European market compliance
• UL 61010-1 and UL 61010-2-201 for electrical safety
• cULus Class 1, Zone 2 for hazardous locations
• Marine certificates: ABS, BV, DNV-GL
• EMC: EN 61000-6-4, EN 61000-6-2
• RoHS compliance: EN 50581:2012
• WEEE compliance: DIRECTIVE/2012/19/EU

Physical Dimensions

• Width: 119 mm (4.7 inches)
• Height: 186 mm (7.3 inches)
• Depth: 135 mm (5.3 inches)
• Weight: 1200 g (2.6 pounds) including base

Installation and Configuration

• Configure with 800xA Control Builder engineering tool
• Follow Safety Manual requirements for SIL applications
• Connect to control network via dual Ethernet ports
• Use COM4 isolated port for service tool connection
• Install SM812 module for high-integrity safety functions
• Monitor status through LED indicators and INIT push button
• Ensure proper ventilation for heat dissipation

Frequently Asked Questions

• What safety level does the PM857 support? It supports up to SIL 3 with SM812 safety module.
• How many I/O signals can it handle? Maximum 128 I/O signals in total.
• What communication interfaces are included? Two Ethernet and two RS-232C serial ports.
• Is redundancy supported? Yes, CPU redundancy is supported for high availability.
• What power supply is required? 24V DC with 19.2-30V operating range.
• What engineering tool is used? 800xA Control Builder for configuration.