2.2 INPUT/OUTPUT (l/O) MODULES
A MICRO 84 Programmable Controller can communicate with up to 112
input and output points. l/O modules are either input or output and are
discrete, register or analog. Each module can be connected to eight l/O
points. The controller can handle a maximum of fourteen l/O modules. (See
the configuration rules listed below for basic and expanded systems.) The
input modules contain the circuitry required to convert incoming voltages
to signal levels compatible with the processor. The output modules contain
the circuitry required to convert processor signal levels to levels
compatible with the devices being controlled. All input and output module
circuits are optically isolated from the internal controller circuitry and
therefore can withstand severe voltage transients without damage to the
controller.
2.2.1 Module Characteristics
The simplicity of interlocking the I/O modules together represents a major
savings in time for both the assembly and programming of the system
when compared to competitive systems. A wide variety of l/O modules are
offered. Each is designed to be an output driving or an input handling
circuit.
The controller and l/O units are designed to operate in an industrial
environment; they operate in locations where electromagnetic noise, high
temperature, humidity, corrosive elements, and mechanical shock are
prevalent.
2.2.2 Module Addressing
The terminal connections on the front of the l/O modules are associated
with both an address in the processor (the reference number) and a specific
piece of user equipment. To communicate, the processor selects the
module address needed during operation. The proper addressing order is
accomplished internally by the processor according to the module type
and its physical location. The closer to the processor, the lower the module
circuit address. This allows the installation of additional modules without
repositioning the existing modules.
2.2.3 l/O Configuration Rules
Before configuring the l/O module portion of your Micro 84 PC system, refer
to the serial number of the PC. If the PC serial number ends with “A”, it is
an expanded system. Follow the configuration rules in Section 2.2.3.2. If
the PC serial number does not have an “A” suffix, it is a basic system. For
basic systems, follow the configuration rules in Section 2.2.3.1. Contact
your distributor or local sales office for information on upgrades.
2.2.3.1 l/O Configuration Rules
-
Basic System
A Micro 84 Basic System has either 13 mixed l/O modules or 8 discrete l/O
modules. The 13 mixed modules can be discrete, register, and analog
modules, according to the following limitations.
a)
A maximum of four 8370 BCD Register Output
or
B374 4-20mA Analog
Output Modules may be installed on one system.
b) A maximum of one 8371 BCD Register Input, one B373 0-1OVDC
Analog Input, or one B375 4-20mA Analog Input Module may be
installed on .a system.
2-2
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