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Emerson 1700 User Manual

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Installation Manual
29
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Begin
Chapter 4
Output Wiring – Model 1700/2700 
Analog Transmitters
4.1
Overview
This chapter explains how to wire outputs for Model 1700 or 2700 transmitters with the analog 
outputs option board (output option code A). 
Note: If you do not know what outputs option board is in your transmitter, see Section 1.4.
It is the user’s responsibility to verify that the specific installation meets the local and national safety 
requirements and electrical codes.
4.2
Output terminals and output types
Table 4-1 describes the outputs and communication protocols available for the Model 1700 or 2700 
analog transmitter.
4.3
Output wiring
Output wiring requirements depend on how you will use the analog functionality and the HART or 
Modbus protocol. This chapter describes several possible configurations:
•
Figure 4-1 shows the wiring requirements for the mA output (terminals 1 and 2) and the 
frequency output (terminals 3 and 4).
•
Figure 4-2 shows the wiring requirements for the mA output (terminals 1 and 2) if it will be 
used for HART communications in addition to the mA signal.
•
Figure 4-3 shows the wiring requirements for RS-485 communications using the RS-485 
output (terminals 5 and 6).
•
Figure 4-4 shows the wiring requirements for connecting the transmitter to a HART multidrop 
network.
Table 4-1
Terminals and output types
Terminals
Model 1700 output type
Model 2700 output type
Communication
1 & 2
Milliamp/Bell 202
(1)
(1) The Bell 202 signal is superimposed on the mA output.
Milliamp/Bell 202
HART
3 & 4
Frequency
• Frequency (default)
• Discrete
None
5 & 6
RS-485
RS-485
• HART (default)
• Modbus