Filter
Top Products
LF-Series Flowmeters: Sensor/Transmitter Installation 27
I/O Wiring – FM AN I/O Wiring – FM FB and PAI/O Wiring – FM CIOSensor Wiring
Chapter 6
I/O Wiring – FM AN Transmitters
6.1 Overview
This chapter explains how to wire outputs for LF-Series field-mount AN transmitters. If you don’t
know your transmitter type, see Section 1.6.
It is the user’s responsibility to verify that the specific installation meets the local and national safety
requirements and electrical codes.
6.2 Output terminals and output types
Table 6-1 describes the outputs and communication protocols available for the LF-Series field-mount
AN transmitter.
6.3 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 6-1 shows the wiring requirements for the mA output (terminals 1 and 2) and the
frequency output (terminals 3 and 4).
• Figure 6-2 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 6-3 shows the wiring requirements for RS-485 communications using the RS-485
output (terminals 5 and 6).
• Figure 6-4 shows the wiring requirements for connecting the transmitter to a HART multidrop
network.
Table 6-1 Terminals and output types
Terminals Output type Communication
1 & 2 Milliamp/Bell 202
(1)
(1) The Bell 202 signal is superimposed on the mA output.
HART
3 & 4 Frequency None
5 & 6 RS-485 • Modbus (default)
•HART