ABBAC 800M Controller Hardware Product Guide

against low voltage in order to prevent controller malfunction.

Should there be a risk that the +24 V at the PM8xx power terminals could drop 

below 19.2 V for more than 1 ms, then an energy reservoir must be used for 

Powering Units.

ABB strongly recommends using a DC/DC converter and extra energy reservoir in 

case external DC-supply with longer cables than 10 m is used. 

I/O System

There are several methods of connecting I/O systems to the AC 800M Controller:

• S100 I/O via CI856.

• S800 I/O units via the ModuleBus. Support for hot configuration during run, 

redundancy on all levels, HART routing, and Sequence-of-Events (SOE).

• S800 I/O units via CI854/CI854A and CI840, PROFIBUS DP. Support for 

HART routing, redundancy on all levels, and hot configuration during run.

• S800 I/O units via CI854/CI854A and CI801, PROFIBUS DP. Support for 

HART routing, and hot configuration during run.

• S900 I/O units via CI854/CI854A, PROFIBUS DP.

• ABB Drives can be connected to the ModuleBus, via CI801. Some Drives 

equipment can be connected directly to PROFIBUS or PROFINET IO. Please 

refer to Drives-specific documentation for more information.

• Genius remote I/O (TRIO) via the CI862.

• Satt I/O on ControlNet (19” Satt rack I/O, S200 I/O and S200L I/O) via the 

CI865.

• PROFINET IO via CI871

For further information about supported I/O-units, refer to I/O-specific 

documentation, see Released User Manuals and Release Notes on page 16.

S800 I/O

See Figure 8 on page 40 for examples of AC 800M / S800 I/O interconnection. 

The top right area of Figure 8 on page 40 shows one cluster (or group) of units, 

connected to the built-in electrical ModuleBus of an AC 800M Controller. The 

maximum number of units per cluster is 12. However, a further seven clusters, each 

comprising of up to 12 units, can be added to the optical ModuleBus. This results in 

a total count of 96 units for the local ModuleBus.

S100 I/O

S100 I/O are connected to the AC 800M, via the communication unit CI856. A bus 

extension cable TK575/TK580, together with DSBC174/DSBC176 or DSBC173A, 

connects the S100 I/O units to the base plate, TP856, of CI856. Up to five S100 I/O 

racks can be connected to the CI856. 

Redundant S100 I/O bus extension can not be connected to CI856.

S900 I/O

S900 I/O are connected to the AC 800M, via PROFIBUS DP and CI854/CI854A. 

The S900 I/O system is a remote I/O system for use in hazardous areas. Due to its 

explosion protection certificates, the S900 process I/O system can be installed in 

both hazardous areas (zone 1 and zone 2) and safe areas.

Other I/O Systems

A PROFIBUS DP segment (or node), shown on the top left-hand side of Figure 8 on 

page 40, allows for a large increase in the numbers of units connected to each 

AC 800M Controller. The segment is shown here with a Fieldbus Communications 

Interface (FCI) unit (type CI840), connected to the PROFIBUS DP network. The 

use of FCI units, or other types of adapters, allows the selection of units from 

several I/O families.

In redundant CPU configuration, connection of S800 I/O is done only with the 

optical ModuleBus. See Figure 9 on page 41. Each cluster of I/O units is 

connected to two TB840s. Each processor unit is connected to one of the 

TB840s. Note that the built-in electrical ModuleBus can not be used in redundant 

CPU configuration.

Note that a PM851/PM851A is restricted to one optical ModuleBus cluster.

Genius remote I/O (TRIO)

TRIO is a remote I/O product that provides discrete, analog and high-speed counter 

blocks for connection to the AC 800M. Configuration of the I/O block units and the 

CI862 is done using Control Builder M.

The CI862 Communication Expansion Module (CEM), connects a TRIO Field Bus 

to the controller AC 800M. The connection between CI862 and AC 800M is done 

via the CEX-Bus. 

A single CI862 can connect 30 blocks to a single LAN. The AC 800M can have up 

to four single lans or four redundant lans. The maximum I/O with TRIO in an 

AC 800M is 1000 IO points.The CI862 can be set redundant.

TRIO blocks, are self-contained, configurable I/O blocks used to interface field 

devices to the CI862 communications bus. These blocks can be individually 

installed on machines, in junction boxes, or grouped in racks or panels. A TRIO 

block is made of cast aluminum, and weighs approximately 1.8 kg (4 pounds). It 

measures approximately 22.5 x 10 x 7.5 cm (9 x 4 x 3 inches). Each block has its 

own communications capability and microprocessor, and provides from 6 to 32 

circuits for connecting input and output devices. You can place blocks on the bus in 

any combination or sequence. You can use a mix of blocks on the same bus.

Satt I/O interface

The Satt I/O system consists of Rack I/O and Series 200 I/O family (S200 I/O, 

S200L I/O and I/O 200C). CI865 connects to Rack I/O, via the adapter 200-RACN, 

and to Series 200 I/O family, via the adapter 200-ACN.

The CI865 module is the AC 800M system’s communication interface for