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Installation Manual 33
Output Wiring – Configurable I/O SpecificationsOutput Wiring – Fieldbus/PROFIBUSOutput Wiring – Intrinsically Safe
Chapter 5
Output Wiring – Model 1700/2700 Intrinsically
Safe Transmitters
5.1 Overview
This chapter explains how to wire outputs for Model 1700 or 2700 transmitters with the intrinsically
safe outputs option board (output option code D).
Note: If you do not know what outputs option board is in your transmitter, see Section 1.4.
Intrinsically safe outputs require external power. “External power” means that the terminals must be
connected to an independent power supply. The output wiring instructions include power setup and
power wiring.
Note: The term “passive” is sometimes used to describe externally powered outputs.
Output wiring requirements depend on whether the transmitter will be installed in a safe area or a
hazardous area. This chapter describes several possible configurations:
• Section 5.3 describes wiring requirements for the outputs if the transmitter will be installed in
a safe area.
• Section 5.4 describes wiring requirements for the outputs if the transmitter will be installed in
a hazardous area.
It is the user’s responsibility to verify that the specific installation meets the local and national safety
requirements and electrical codes.
5.2 Output terminals and output types
Table 5-1 describes the outputs and communication protocols available for the Model 1700 or 2700
intrinsically safe transmitter.
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.
Table 5-1 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
(1)
HART
3 & 4 Frequency • Frequency (default)
• Discrete
None
5 & 6 Not used Milliamp None