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LF-Series Flowmeters: Sensor/Transmitter Installation 31
I/O Wiring – FM AN I/O Wiring – FM FB and PAI/O Wiring – FM CIOSensor Wiring
Chapter 7
I/O Wiring – FM CIO Transmitters
7.1 Overview
This chapter explains how to wire outputs for LF-Series field-mount CIO 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.
7.2 Channel configuration
The six output terminals are divided into three pairs. The pairs are called Channels A, B, and C.
Channel A is terminals 1 and 2; Channel B is terminals 3 and 4; and Channel C is terminals 5 and 6.
Variable assignments are governed by channel configuration.
Output wiring requirements depend on how you will configure the transmitter channels. The
configuration options are shown in Table 7-1 and Figure 7-1. You can use a HART Communicator or
ProLink II software to configure channels. See the transmitter configuration manual for more
information.
If Channel B is configured as a frequency output or discrete output, it can also be configured to use
either internal or external power. Channel C can be configured to use either internal or external power,
independent of its output configuration.
• “Internal power” means that the terminals are powered automatically by the transmitter. The
output wiring instructions do not include power setup and power wiring.
• “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 terms “active” and “passive” are sometimes used to describe internally and externally
powered outputs.
Note: You cannot configure the following combination: Channel B = discrete output,
Channel C = frequency output. If you need both a frequency output and a discrete output, use the
following: Channel B = frequency output, Channel C = discrete output. For more information, see the
transmitter configuration manual.