Discrete I/O Modules; Discrete I/O Module Point Density; Standard Density Discrete I/O Module Features - GE 90-30 PLC Series Installation And Hardware Manual

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Discrete I/O Modules

Discrete I/O Module Point Density

There are two density categories for these modules:

Standard Density Discrete I/O Module Features

Standard Density( 6 points or less) Modules have the following features (refer to the following
figure):
7-2 Series 90-30 PLC Installation and Hardware Manual – August 2002
output modules are provided in three versions, ( ) a 2-channel current module, (2) a 2-channel
voltage module, and (3) a high-density current/voltage module with 8 analog output channels.
Analog Combination Module
An analog combination module provides four A/D input channels and two D/A output
channels on one module. Each of the input and output channels can be configured individually
for current or voltage mode.
Third-Party Modules
In addition to the modules discussed in this chapter, numerous third-party I/O modules (and
other hardware and software products) for the Series 90-30 PLC are available to meet a wide
variety of needs. For information on third-party modules, consult the following:
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Your GE PLC distributor or sales engineer
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The GE web site at http://www.ge-ip.com
Standard Density Modules: Standard density modules have up to 6 circuits (also called
"points") per module. These modules are equipped with a removable terminal board. See the
following figure.
High Density Modules: High density modules have 32 circuits per module. These modules
have either a 50-pin connector, or two 24-pin connectors mounted on their faceplates.
Connection choices are discussed later in this chapter.
Removable Terminal Board. You can remove the terminal board from the module in order
to wire it, if desired. Then, when you are finished wiring it, you can easily reinstall it on the
module. However, some prefer to leave it on the module when wiring. If you ever need to
replace a module, you don't have to do any rewiring if your old terminal board is still in good
condition. Simply remove the wired terminal board from the old module and install it on the
new module. The terminal board screw terminals are also convenient points for measuring
voltages while testing or troubleshooting.
Hinged Front Cover. The cover is easily opened to access the terminal board connections.
Normally it's kept closed to protect personnel from accidentally touching a hot terminal. Note
in the following figure that the back side of the front cover insert contains a schematic diagram
of the terminal board connections. The module catalog number (IC693MDL940 in the
example shown) is printed on the bottom of the front cover insert. The module catalog
GFK-0356Q