Emerson 1700, 2700 1 Channel configuration, 6.3mA output wiring, Terminals, Configuration options

Output Wiring – Model 2700 Configurable I/O Transmitters

Table 6-1Channel configuration

Channel	Terminals	Configuration options	Power
A	1 & 2	mA output with HART/Bell 202(1)	Internal
B	3 & 4	• mA output (default)	Internal
		• Frequency output	Internal or external(2)
		• Discrete output	Internal or external
C	5 & 6	• Frequency output (default)(3)	Internal or external
		• Discrete output	Internal or external
		• Discrete input	Internal or external

(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 6-1Configuration 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

6.3mA 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 Micro Motion® Model 1700 and 2700 Transmitters