7-8 Series 90-30 PLC Installation and Hardware Manual
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August 2002 GFK-0356Q
7
Analog Module Features
Analog Modules have the following basic features (refer to the following figure):
Ŷ 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 if it is good condition. The terminal board screw terminals are also convenient
points for measuring voltages while testing or troubleshooting.
Ŷ Hinged Front Cover. The cover is easily opened to access the terminal board connections.
For normal operation, it is 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
(IC693ALG39 in this example) is printed on the bottom of the front cover insert. The module
catalog number is also printed on the label on the side of the module. However, in order to
see this side label, the module has to be removed from the PLC
Ŷ On the front side of the front cover insert are lines that correspond to the module’s I/O points.
You can temporarily remove the insert and write the signal name for each point on the
appropriate line to aid in testing or troubleshooting.
Ŷ Also on the front side of the front cover insert, running vertically on the left edge of the insert,
is a colored line that identifies the type of module: Blue = DC, Red = AC, and Gray = Analog.
Ŷ Module Lens Cap. Located on the top front of the module, it covers the LED (Light Emitting
Diode) OK status light. This light indicates the basic status of the module. For normal
operation, the OK LED should be on.
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