Emerson Rosemount 702 - 702 Dx42)87

85
Reference Manual
00809-0200-4702, Rev CA
Section 9: Operation and Maintenance: Models 702DX32 and 702DX42
February 2013
Operation and Maintenance: Models 702DX32 and
702DX42
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
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.
Single or Dual Input, No Logic
Switch
Input
Wireless
Output
Switch
Input
Wireless
Output
CH1 PV CH2 SV
Closed TRUE (1.0) Closed TRUE
(1.0)
Open FALSE (0.0) Open FALSE
(0.0)