Emerson Rosemount 702, Справочное руководство, Страница: 90 / 142

80
Reference Manual
00809-0200-4702, Rev DA
Operation and Maintenance: Models 702DX32 and 702DX42
July 2017
Operation and Maintenance: Models 702DX32 and 702DX42
9.2 Discrete input from switches
9.2.1 Dry contact inputs, measurement option code 32, 42 (702DX32,
702DX42)
The Rosemount 702 Transmitter has a pair of screw terminals for each of two channels, and a pair of
communication terminals. These terminals are labeled as follows:
Figure 9-1. Terminal Diagram
9.2.2 Wireless output specifications
Dual Input
The Rosemount 702 Transmitter will accept the input from one or two single pole single throw switches
on inputs CH1 and CH2. The wireless output of the transmitter will be both a primary variable (PV) 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.
CH1+: Channel 1 Positive
CMN: Common
CH2+: Channel 2 Positive
CMN: Common
COMM: Communication