ABBAC 800M and Communication interfaces Compact Product Suite Outline of all modules

AC 800M is a family of rail-mounted modules, consisting of CPUs, communication 

modules, power supply modules and various accessories. There are several CPU modules 

to choose from, ranging from medium processor power and low cost to high processor 

power and support for full redundancy

For updated information regarding AC 800M hardware please 

visit our Hardware Selector. In the selector you can compare 

different communication modules, S800 IO modules, module 

termination units, AC 800M controllers, power supplies, voters, 

panels and also print your own pdf files.

www.compacthardwareselector.com

Features / CPUs PM851A PM856A PM858 PM860A PM861A (Classic)

Article number 3BSE066485R1

(PM851AK01)

3BSE066490R1 

(PM856A)

3BSE082895R1 

(PM858K01)

3BSE082896R1 

(PM858K02)

3BSE066495R1 

(PM860AK01)

3BSE018157R1

(PM861K01)

3BSE018160R1

(PM861K02)

Processor Unit PM851AK01 incl:

1 PM851A CPU and 

required optional 

items.

PM856AK01 incl:

1 PM856A CPU and 

required optional 

items.

PM858K01 incl:

1 PM858 CPU and 

required optional items. 

PM858K02 incl:

2 PM858K01

PM860AK01 incl:

1 PM860A CPU and 

required optional 

items.

PM861AK01 incl:

1 PM861A CPU and

required optional items

PM861AK02 incl:

2 PM861AK01

Optional items 

(partly included in Processor 

Units, see Price List)

TP830 Baseplate, TP850 CEX-bus term., TK850 CEX-bus cable, TB807, Modulebus term, Battery RAM backup, TB852/

TB853 RCU-link term, TB851/TB855/TB856 RCU-link cable, SB822 External Battery Unit, TK212A Tool cable, TC562 Short 

Distance Modem, TK853V020 Modem cable, BC810K02, BC820K02, CEX-bus Interconnection unit; TK851V010 Connection 

cable, SD831/SD832/SD833/SD853/SD854 Power Supply, SS832 Voting Unit, Mains Breaker Kit.

Clock frequency 24 MHz 24 MHz 33 MHz 48 MHz 48 MHz

Memory (RAM) 8 MB 8 MB 16MB 8 MB 16 MB

From 5.1 FP4 12 MB 16 MB 16 MB

RAM available for application 2.282 MB 2.282 MB 7.147 MB 2.282 MB 7.155 MB

From 5.1 FP4 6.253 MB 10.337 MB 10.346 MB

Processor type MPC860 MPC860 MPC866 MPC860 MPC860

Flash memory for storage 

of application and data

Yes Yes Yes Yes Yes

CPU redundancy support No No Yes No Yes

Features / CPUs PM851A PM856A PM858 PM860A PM861A (Classic)

Switch over time in red. conf. - - Max 10 ms - Max 10 ms

Performance, 1000 boolean 

operations (a:=b and c)

0.46 ms 0.46 ms 0.36 ms 0.23 ms -

No. controllers per control projects 32

No. of applications per control 

project

1024

No. of applications per controller 32

No. of programs per application 64

No. of tasks per controller 32

Number of different cycle times 32

Cycle time per application

programs

Down to 1 ms

Flash PROM for firmware storage 2 MB 2 MB 4 MB 2 MB 2 MB

Power supply 24 V DC (19.2-30 V DC) max 5 % ripple acc. to IEC 61131-2

Power consumption +24 V 

(typ/max)

180/300 mA 180/300 mA 210/360 mA 180/300 mA 250/430 mA

Power dissipation typ. 4.32 W 4.32 W 5.1 W 4.32 W 6.0 W

Power Reservoir Internal 5 ms power reservoir, sufficient for the CPU to make a controlled power down

Power supply connector Detachable 4-pole screw terminal block

Redundant power supply

status inputs

Yes: 2 inputs designated SA, SB (Max 30 V, high level >15 V, low level < 8 V)

Built-in back-up battery Type: Lithium, 3.6 V, 0.95 Ah, size 1/2 AA, 0.3 g Lithium content

Real-time clock stability 100 ppm (approx. 1 h/year)

Clock synchronization 1 ms between AC 800M controllers by CNCP protocol

Comm. modules on CEX bus 1 12 12 12 12

Supply current on CEX bus Supply current: Max 24 V - 2.4 A (fuse 3.15 A fast, PM891 has an embedded auto fuse)

I/O clusters on Modulebus with 

non-redundant CPU

1 el. + 1 opt. 1 el. + 7 opt. 1 el. + 7 opt. 1 el. + 7 opt. 1 el. + 7 opt.

I/O clusters on Modulebus with 

redundant CPU

NA NA 0 el. + 7 opt. NA 0 el. + 7 opt.

I/O capacity on Modulebus with 

non-redundant/redundant CPU

Max 24/NA I/O 

modules

Max 96/NA I/O 

modules

Max 96/84 I/O 

modules

Max 96/NA I/O 

modules

Max 96/84 I/O 

modules

Modulebus scan rate 0 - 100 ms (actual time depending on number of I/O modules)

Supply current on Electrical

Modulebus

Supply current: Max 24 V - 1.0 A (short circuit proof, fuse 2.0 A), Max 5 V - 1.5 A (short circuit proof)

I/O capacity on PROFIBUS

(remote I/O)

Max 99 I/O stations (max 62 redundant I/O stations), max 24 I/O modules per I/O station (max 12 redundant I/O 

pairs)

Ethernet channels 1 2 2 2 2

Ethernet interface Ethernet (IEEE 802.3), 10 Mbit/s, RJ-45, female (8-pole)

Control Network protocol MMS (Manufacturing Message Service) and IAC (Inter Application Communication)

Recommended Control

Network backbone

100 Mbit/s switched Ethernet

No. of controllers on Control 

Network

Max 50

RS-232C interface 2 (one general, 1 for service tool)

RS-232C interface (COM3) 

(non red.conf. only)

RS-232C, 75-19 200 baud, RJ-45 female (8-pole), not opto isolated, full RTS-CTS support

RS-232C interface (COM4) 

(non red.conf. only)

RS-232C, 9 600 baud, RJ-45 female (8-pole), opto isolated, no RTS-CTS support

Temperature

• Operating

• Storage

+5 to +55 °C (+41 to +131 °F)

-40 to +70 °C (-40 to +158 °F)

Temperature changes 3 °C/minutes according to IEC/EN 61131-2

Altitude 2000 m according to IEC/EN 61131-2