ABB PM891 3BSE053240R1 Communication Expansion Bus Module

ABB PM891 (3BSE053240R1) is a high-performance CPU+Communication Expansion Bus (CEX Bus) core module of AC800M/800xA system, which focuses on high reliability redundancy and multi protocol communication expansion. It is the central unit of process industry DCS.
1、 Core positioning and model
Model: PM891
Order number: 3BSE053240R1
Series: ABB AC800M/System 800xA DCS
Type: CPU+CEX Communication Expansion Bus Module (Non pure Communication Module, Integrated Core Processing+Bus Expansion)
Core functions: System logic operation, real-time control, CEX bus management, multi protocol communication gateway
2、 Key hardware specifications (authoritative parameters)
table
Parameter specifications
Processor PowerPC MPC8270, 32-bit RISC, 450MHz
256MB RAM+512MB~2GB Flash (program/data storage)
CEX bus dedicated communication expansion bus, used to expand communication interface modules (such as Profibus, Profinet, Modbus)
Ethernet dual RJ45 (10/100Mbps): CN1/CN2 (control network redundancy); COM4 (Isolation, Configuration Tool)
Power supply 24VDC (± 10%), bottom board power supply, typical power consumption ≤ 15W
Redundancy 1:1 CPU hot standby, CEX bus redundancy, communication redundancy; Switching ≤ 10ms
I/O expansion supports up to 4096 I/O points, connecting S800 I/O to the expansion rack
Environmental working temperature: -25 ℃ to+70 ℃; Protection: IP20; No built-in battery
Install the backplane (such as TP830) and support hot swapping
Weight approximately 2.1-2.5kg
3、 CEX Bus (Communication Expansion Core)
CEX Bus: PM891 exclusive high-speed communication expansion bus, used to expand various communication interface units (CIUs)
Scalability:
Can be connected to BC810 bus coupler to segment CEX bus and improve availability
Support redundant communication interfaces, single channel failure does not affect the system
Scalable: Profibus DP, Profinet IRT, EtherNet/IP, Modbus TCP/RTU, FF HSE, DNP3.0, etc
Purpose: To connect third-party PLCs, smart meters SCADA、 Remote I/O to achieve cross system data interoperability
4、 Core functions
real-time control
Minimum control cycle of 1ms, supporting multi task priority scheduling
Built in PID, fuzzy control, custom algorithms, suitable for complex process control
Communication Management
Dual Ethernet redundancy ensures stable control network
CEX bus extends multiple protocols and is compatible with mainstream industrial buses
Support high reliability communication mechanisms such as IEC 61850, PRP/HSR, etc
system redundancy
Four fold redundancy of CPU, CEX bus, communication, and power supply
Fault self diagnosis, automatic switching, disturbance free operation, in compliance with SIL 2 safety level
Expansion and Operations
Online programming, hot plugging, remote diagnosis, firmware upgrade
Large capacity storage, supporting complex programs and historical data recording
5、 Typical application scenarios
Electricity: Control of thermal power plants/combined cycle units, automation of substations
Petrochemical industry: reactor, distillation tower, long-distance pipeline control
Metallurgy: Rolling mill, blast furnace, continuous casting control system
Water treatment/nuclear power auxiliary control: continuous production scenarios with high reliability and safety requirements