ABB PM877 3BDH000777R1 Central_Unit Controller

ABB PM877 3BDH000777R1 Central_Unit Controller

The AC 800M controller consists of a selection of units mounted on horizontal

DIN-rails, which can be housed within an enclosure. The majority of units consist of

a base mounting plate and a removable module attached with screws.

The hardware units that form the AC 800 M controller are:

• Central Processor unit (CPU)

• Communication interface modules for different protocols

• S800 I/O modules

• Power supply modules

Various I/O systems can be connected to the AC 800M controller, either directly

(S800 I/O) or via PROFIBUS or FOUNDATION.

Figure 1. Example of an AC 800M Controller with an S800 I/O Unit

The CPU consist of a base plate TP830 (Terminal Plate) and a processor module

PM8XX with various speed and memory combinations.

The base plate TP830 carries the majority of the connections to processor, the power

supplies and communication interfaces, as well as to external buses.

Communication Interface

A number of communication modules can be connected to the controller. See

Appendix A, IndustrialIT System 800xA AC 800M Controller - Data Sheet for

more information on the various modules.

Communication Interface connected with CEX bus:

Up to 12 communication units can be placed on Communication Expansion Bus

(CEX) bus.

The CEX bus must be terminated if a communication unit is connected. A CEX bus

termination is delivered with the e CPU: tb850 (male) or TB851 (female).

An extension cable TK850 with connector DB25P with metal housing and a length

of 0.7meter (1.3') can be used for extending the CEX bus to a second din rail.

S800 I/O

S800 I/O is a distributed and modular I/O system that communicates with

controllers over PROFIBUS-DP/DPV1 or direct (via Modulebus).

The S800 I/O system is DIN rail mounted and consists of Fieldbus Communication

Interfaces, Modulebus Modems, S800 I/O modules and Module Termination Units

(MTU). S800 I/O modules (not S800L) are mounted on MTU's, this makes them

hot-swappable. Depended on the mounting requirement (horizontal or vertical) and

on the field termination needs (powering, fusing etc.) there are numerous of MTU's

to choose from.

The S800 I/O system supports fully redundant applications, redundancy can be built

in on both communication level and I/O module level.

S800 I/O connected with PROFIBUS- DP/DPV1:

• Field Communication Interface CI801 or CI840 is the I/O station master

• Maximum 24 I/O modules per I/O station

• 1 base I/O cluster with up to 12 I/O modules (connected via electrical

Modulebus)

• 1-7 additional I/O clusters with up to 12 I/O modules per cluster (connected via

optical Modulebus using Modulebus Modems)

Mounting AC 800M and S800 I/O Units onto DIN-Rail

AC 800M and S800 I/O units are DIN-rail mountable. Each unit has a DIN rail

locking mechanism that achieve mechanical locking and effective grounding.

The additional screw lugs, located in the lower part of the units are used to provide

extra fastening in environments subject to excessive vibrations. AC 800M units

(CPU and communication interfaces) must be mounted on horizontal DIN rails.

S800 I/O units can be mounted on both horizontal and vertical DIN rails.

There are two ways of mounting AC 800M and S800 I/O in cabinets, open rack or

other types of installations:

• Mounting on DIN rail attached to a metal sheet

• Mounting on prefabricated aluminium profile with DIN rail

All conductive structural components of the installation must be bonded together

with good and permanent connections for electrical safety and EMC reasons.

The bonding should preferably be made with self-tapping cutting head screws.

On painted surfaces where fastening is done by screw and nut, the paint must be

removed from the contact surfaces. Apply conductive grease on surfaces to ensure a

permanent connection. The cabinet/rack shall be properly connected to protective

earth/ground.

Mechanical Installation - Metal Sheet

The DIN-rail is mounted on an unpainted metal sheet with fastening screws every

100 mm to ensure good mechanical stability and a good chassis ground connection

in the cabinet or an open rack, see Figure 3.

There are aluminum profiles for horizontal and vertical mounting. The aluminum

profile gives an excellent grounding and rigid mounting of products concerned.

The aluminum profile shall be fastened to the cabinet with at least 4 self-tapping

screws.

The profile has grooves for screws that can be used for fastening the modules in an

environment with excessive vibrations.

The aluminum profiles have one DIN-rail and one cable duct