9 I/O wiring for Model 2700
transmitters with configurable input/
outputs
Topics covered in this chapter:
• Channel configuration
• mA/HART wiring
• Frequency output wiring
• Discrete output wiring
• Discrete input wiring
9.1 Channel configuration
The six wiring terminals are divided into three pairs, and called Channels A, B, and C.
Channel A is terminals 1 and 2; Channel B is terminals 3 and 4; Channel C is terminals 5 and
6. Variable assignments are governed by channel configuration.
Channel configurationTable 9-1:
Channel Terminals Configuration options Power
A 1, 2 mA output with HART/Bell202 Internal
B 3, 4 mA output (default) Internal
Frequency output Internal or external
Discrete output Internal or external
C 5, 6 Frequency output (default) Internal or external
Discrete output Internal or external
Discrete input Internal or external
Notes
• For Channel A, the Bell 202 signal is superimposed on the mA output.
• You must provide power to the outputs when a channel is set to external power.
• When both Channel B and Channel C are configured for frequency output (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.
I/O wiring for Model 2700 transmitters with configurable input/outputs
90 Micro Motion
®
Model 1700 and 2700
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