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Getting Started 21Chapter 1
Using the Internal
Buses
The E1442A 64-Channel Form C Switch Module contains internal buses to
which you can connect any channel contact. Figure 1-8 shows channels 0
and 63 and the internal bus structure. There is a bus for the common (C),
the normally closed (NC), and the normally open (NO) contacts.
Other jumpers provide the means to connect the NC and NO contacts to a
fused +5V pull-up voltage, or to be connected as pull-downs to ground. The
common can be connected to ground. Figure 1-9 shows component/jumper
locations on the module.
Figure 1-8. Internal Bus Structure
C
NC NO
C
NC
NO
C
NC
NO
CH0
CH0
Relay
CH63
Relay
C
NO
NC
NC
CH63
C
NO
NO
NC
C
JM154JM36JM35
T
o
T
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m
i
n
a
l
M
o
d
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e
JM152
F4
NC, NO
Pullup
Module
+5V
Relay Connections
Bus Connections