Ma Output Wiring - Emerson MICRO MOTION 2700 Installation Manual

Output Wiring – Model 2700 Configurable I/O Transmitters
Table 6-1 Channel configuration
Channel
A
B
C
(1) The Bell 202 signal is superimposed on the mA output.
(2) You must provide power to the outputs when a channel is set to external power.
(3) When configured for two frequency outputs (dual pulse), frequency output 2 is generated from the same signal that is sent
to the first frequency output. Frequency output 2 is electrically isolated but not independent.
Figure 6-1 Configuration of configurable I/O terminals
Terminals 1 and 2 (Channel A)
mA1 output
Internal power only
HART (Bell 202) communications
Terminals 3 and 4 (Channel B)
mA2 output or FO or DO1
Power:
• mA – internal only
• FO or DO – internal or external
No communications
Terminals 5 and 6 (Channel C)
FO or DO2 or DI
Power: internal or external
No communications
mA = milliamp
FO = frequency output
DO = discrete output
DI = discrete input
6.3

mA output wiring

The following 4–20 mA wiring diagrams are examples of proper basic wiring for the Model 2700
primary and secondary mA outputs. The following options are shown:
• Basic mA wiring (Figure 6-2)
• HART/analog single-loop wiring (Figure 6-3)
• HART multidrop wiring (Figure 6-4)
Note: If you will configure the transmitter to poll an external temperature or pressure device, you
must wire the mA output to support HART communications. You may use either HART/analog
single-loop wiring or HART multidrop wiring.
42
Terminals Configuration options
1 & 2 mA output with HART/Bell 202
3 & 4 • mA output (default)
• Frequency output
• Discrete output
5 & 6 • Frequency output (default)
• Discrete output
• Discrete input
(1)
(3)
+
–
+
–
+
–
Micro Motion
Power
Internal
Internal
(2)
Internal or external
Internal or external
Internal or external
Internal or external
Internal or external
®
Model 1700 and 2700 Transmitters