Pressure Transducer and Transmitter Wiring Explained
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⌚Timestamps:
00:00 - Intro
00:35 - Transducer and transmitter
01:04 - Pressure switch
01:23 - Pressure transmitter
01:41 - Pressure transmitter wiring
02:34 - Wiring pressure switch to PLC
03:51 - Wiring pressure transmitter to PLC
06:07 - Wiring example
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In this video, we’re going to show you how to wire a few different transducers and transmitters to digital and analog PLC input modules.
We’re also going to analyze a typical instrument field-wiring drawing to show you how PLCs are properly configured for different transducer and transmitter types.
A transducer is a device that converts one form of energy to an electrical or electronic signal.
A Pressure switch is a two-part device consisting of a sensing transducer and an electrical switch.
A pressure switch is a digital device because it has only two possible conditions – open or closed. It is therefore connected to a PLC digital input module.
A Pressure Transmitter is a two-part device consisting of a sensing transducer and a circuit that transmits a standard instrumentation electrical signal representing a physical variable being measured. In most applications, the electrical signal is 4 to 20 mA.
A Pressure Transmitter is an analog device and is therefore connected to a PLC analog input module.
Many people refer to this device as a Transducer. For the sake of simplicity, we’ll continue to refer to it as a Transmitter.
A Pressure Transmitter requires a power supply to operate. Most Pressure Transmitters are two-wire types. Transmitters are also available as four-wire types.
As the name suggests, a two-wire pressure transmitter has only two wires. These two wires provide power for the transmitter and are also the signal lines!
A four-wire transmitter has two wires connected to a power supply and two signal wires connected to the PLC. The power supply can be AC or DC depending on the vendor and model.
1) Digital input – 1756-IF8
We will wire a Gems PS41 series pressure switch to Input 3 of a ControlLogix 1756-IB32 digital input module.
The 1756-IB32 module is capable of supporting up to 32 digital input devices. Each additional device would be wired the same as the Gems pressure switch.
2) Analog input – Single-ended and differential
The analog module can be wired in two possible modes: Single-ended or Differential.
The selection is important as it determines how the module is physically wired.
In Single-Ended mode, we can connect 8 two-wire transmitters sharing one power supply. Each transmitter connection is referred to as a Channel.
2) Analog input – 1756-IF8
The 1756-IF8 module is configured for current input during programming in the I/O configuration.
We will connect the Wika E-11 two-wire transmitter to Channel 5 of a ControlLogix 1756-IF8 analog module.
Details on how to wire more transmitters can be found on the Rockwell Automation website: https://bit.ly/1756IO
2) Analog input – 1756-IF8 - an industry example
Field wiring diagrams vary between companies. In our example, two channels of the 1756-IF8 are wired in Single-Ended Mode.
We’ll look at how Pressure Transmitter ZT-P3606 is connected to Channel 0, and ZT-P3610 is connected to Channel 1. Both transmitters share the same +24V DC Power Supply.
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