Man Al2000_eng.pdf - FF-Automation

AL 2000 User Guide
Page 1 - 3
14/11/2000
1.2 Basic Design
The AL2000 is a modern PLC designed for general purpose industrial automation and
data acquisition. The AL2000's modular design allows each mounting rack to be fitted
with the CPU and I/O modules which best meet the specific demands of each application.
1.2.1 Mounting Rack
Five different sizes of mounting rack are available, with space for 3, 5, 11 or 16 I/O
modules. All mounting racks are delivered with mother boards that connect the different
I/O modules to the CPU. The modular design enables easy and rapid installation of
different hardware configurations. The I/O cabling is connected to detachable screw
terminals on the front edge of each I/O module. All I/O modules can be removed
(or re-positioned in the rack) without disconnecting the I/O cables. The front cover of the
unit hides the screw terminals but allows the LED indicators (indicating the status of
each I/O) to be seen through a window.
1.2.2 Power Supply
Each mounting rack (except MR3 models) must be fitted with a power supply module and
a power connecting module. The power supply cable is connected to the power
connecting module. The power supply module provides the AL2000 with the voltages it
needs. The MR3 includes a single-unit power supply and does not require separate
power connecting and power supply modules.The MR3-mini does not require a power
supply, power for this mounting rack come from the CPU2000P.
1.2.3 Internal Bus
The internal bus handles communication between the I/O modules and the CPU. When
an expansion mounting rack is used, the internal bus is extended from the basic
mounting rack to the expansion mounting rack using a flat cable. The internal bus
provides fast communication and is designed to IEC-Standards IEC47B (CO8) for
electrical features and (CO10) for mechanical features. Each I/O module is connected to
the mother board using DIN41612 connectors. The expansion mounting rack does not
require its own CPU since the internal bus is extended to serve the expansion mounting
rack via a flat cable. The basic mounting rack and the expansion mounting rack (if fitted)
are hereafter collectively referred to as the Basic Unit.
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