702Dx42)87 - Emerson Rosemount 702DX22 Reference Manual

Reference Manual
00809-0200-4702, Rev CA
and a secondary variable (SV). The PV is determined by the CH1 input. The SV is determined by
the CH2 input. A closed switch drives a TRUE output. An Open switch drives a FALSE output.
Note
Any dry contact input can be inverted by the device, so as give the opposite effect. This is useful,
for instance, if a normally open switch is used to replace a normally closed switch.
Figure 9-2. Single, Dual Input
Switch
Input
CH1
Closed
Open
Dual Input, Limit Contact Logic
When configured for Limit Contact Logic, the 702 transmitter will accept the input from two
single pole single throw switches on inputs CH1 and CH2, and will use limit contact logic for the
determination of the wireless outputs. The following tables describe the wireless outputs
available when using limit contact logic.
Operation and Maintenance: Models 702DX32 and
702DX42
Section 9: Operation and Maintenance: Models 702DX32 and 702DX42
Single or Dual Input, No Logic
Wireless Switch
Output Input
PV CH2
TRUE (1.0) Closed
FALSE (0.0) Open
Wireless
Output
SV
TRUE
(1.0)
FALSE
(0.0)
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