Description
‑ Power Supply：24VDC，operating range 19.2‑30VDC；typical power consumption 2.9Weero
‑ Mechanical Structure：DIN‑rail slide‑lock compact CPU module, matched with TP830 baseplate；overall weight approx 1.1kg
‑ On‑board Resources：MPC860 24‑bit processor；16MB total RAM(10.456MB application memory)；2MB Flash firmware storage；CompactFlash card slot；hardware watchdog circuit；lithium battery for real‑time clock and retention data；hardware self‑diagnosis circuit
‑ Communication Interface：internal CEX bus for S800 I/O modules；dual 10/100M RJ45 ethernet ports；COM3 RS232 modem port；COM4 isolated RS232 configuration service portABB
‑ Galvanic Isolation：serial communication channel adopt galvanic isolation, isolation rating 2500VAC
‑ Core Function：execute control logic, PID loop adjustment, interlock & sequence control, dual‑ethernet network communication, CompactFlash program backup, hardware watchdog, comprehensive hardware self‑diagnosis
‑ Protection：surge‑suppression and ESD protection for communication ports, reverse‑polarity power‑supply protection
‑ Status LED Indicators：PWR power indicator, RUN running status, ERR fault alarm, COM bus status, ETH network status LED, INIT reset button
‑ Weight：approx 1.1kg
‑ Installed on TP830 base plate, DIN‑rail mounting, exchanges data with S800 I/O modules through internal CEX back‑plane busABB. Single station runs one PM856AK01 as main controller, hardware does not support main‑standby CPU redundancy.
‑ Supports IEC61131‑3 standard programming languages FBD, LD, ST, SFC. Completes continuous PID regulation, cascade control, safety interlock protection, sequential logic control. Dual ethernet ports connect control network and 800xA operator station. Two RS232 serial ports are used for local program download, debugging and third‑party serial device communication. CompactFlash card realizes program backup, restore and firmware upgrade. On‑board lithium battery keeps real‑time clock and retention process variables after power‑off. Independent hardware watchdog realizes automatic reset when program runs abnormally.
‑ Module self‑diagnosis continuously monitors 24V power supply, CPU operation, memory fault, CEX bus and communication channel abnormality; fault codes and alarm messages are uploaded to 800xA operator workstation.
‑ Cannot run independently; must cooperate with TP830 baseplate, 24VDC power supply, S800 I/O modules and Control Builder M engineering software.
Distinction from PM825: PM825 belongs to old Advant AC80 series; PM856AK01 belongs to later AC800M Compact series, adopts CEX bus, larger memory, matches Control Builder M software, hardware platform and software are not compatible with PM825, cannot cross‑model direct replacement.
‑ Continuously monitors power supply, memory, CEX back‑plane bus and each communication channel status. Hardware fault will light front‑panel ERR fault LED and report fault alarm code to operator station.
‑ No local historical‑data storage; runtime status and fault diagnosis information are read via Control Builder M engineering tool.
‑ CPU hardware failure will lead to control station out‑of‑service; this model has no native redundancy function.
‑ Back‑plane: CEX bus connector on TP830 baseplate, connect I/O bus and 24VDC power supply.
‑ External interfaces：dual RJ45 ethernet ports, COM3 RS232 port, COM4 isolated RS232 port, CompactFlash card slot, INIT reset button.
‑ Mounting：DIN‑rail installation with TP830 baseplate
‑ Operating Temperature：+5 ℃ ~ +55 ℃eero
‑ Storage Temperature：‑40 ℃ ~ +70 ℃eero
‑ Relative Humidity：5‑95 %RH, non‑condensing
‑ Pollution degree：Degree 2
‑ Protection Class：IP20, cabinet‑internal installation.
- PM856AK01 processor unit（3BSE066490R1）
Complementary parts: TP830 base plate, 24VDC power supply, S800 series I/O modules, CompactFlash memory card, industrial shielded ethernet cables, Control Builder M engineering & 800xA monitoring software.
‑ Cut off power before inserting or replacing PM856AK01 CPU module, hot‑swap function is not supported. Must use matching TP830 baseplate, cannot work with PM825 old‑style base. Use industrial shielded cables for ethernet and serial wiring. Pay attention to lithium‑battery ageing, replace battery periodically to avoid loss of clock and retention data.
‑ For spare‑part replacement: verify full model PM856AK01 and part‑number 3BSE066490R1; after hardware installation download firmware and user control program, verify logic operation, PID loop regulation and all communication channel data interaction. Wrong baseplate or incompatible firmware version will cause station startup failure.
‑ Module fault will result in control station stop; this hardware does not support main‑standby redundancy.
Power plant, paper‑making, chemical industry AC800M Compact DCS control cabinets; medium‑size process control station main controller; industrial spare‑part for AC800M Compact DCS CPU unit.
- ABB AC800M Compact dedicated PM856AK01 processor unit (3BSE066490R1), total 16MB RAM, 10.456MB application memory, CompactFlash card slot for program backup, requires TP830 baseplateABB Group.
- MPC860 24‑bit processor, dual ethernet, dual RS232 multi‑communication interfaces, CEX high‑speed I/O back‑plane bus.
- Fully complies with IEC61131‑3 standard, completes PID, interlock, sequence control for medium‑scale automation projects.
- DIN‑rail slide‑lock structure, does not support hot‑swap and CPU redundancy, power‑off required for replacement.
- Matches Control Builder M / 800xA system; hardware and software are incompatible with PM825 Advant AC80 series, cannot directly substitute each other.
- Mature discontinued DCS spare‑part, only applied for old‑system maintenance and retrofit projects。
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