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periSNOOP 4-20mA Current Loop Monitor

Reads an existing 4-20 mA loop. The PLC sees no change.

What periSNOOP does

periSNOOP sits in an existing 4-20 mA connection between a sensor and its controller. The loop is opened once, during installation, and periSNOOP is wired in at its terminals. From then on the same current flows as before and the controller reads exactly the signal it read before. In parallel, periSNOOP publishes the measured value to the IP network over Single Pair Ethernet (SPE).

Ratings, measured values and order codes are in the periSNOOP 4-20mA datasheet.

What stays the same

What periSNOOP does not touch is the control system. The sensor stays, the loop stays, the PLC program stays, and the signal the controller reads is the one it read before. The work is a terminal connection during a planned stop, not a control project.

That is the difference that matters on a loop that has been signed off and running for years. Getting its value onto the IP network usually means an I/O card, a gateway, or a change to the control logic, and each of those reopens something that already works. periSNOOP leaves all of it alone. The application note PLC versus periSNOOP for Sensor Data Monitoring works that comparison through in detail.

periSNOOP 4-20mA current loop monitor in its aluminium housing, with three cable glands
periSNOOP 4-20mA with the housing open, showing the push-in terminal blocks for the sensor loop and the hybrid SPE cable
Diagram: a 4-20 mA loop running from sensor to PLC passes through a periSNOOP, which sends the measured value on to the network over Single Pair Ethernet

periSNOOP or periNODE 4-20mA?

periNODE 4-20mA replaces the connection: it supplies the sensor, owns the loop, and publishes the value. periSNOOP joins an existing connection instead. The sensor keeps its own supply and its own controller, and periSNOOP reads the loop in passing.

Choose periNODE 4-20mA for a new installation, or when the sensor is being connected fresh. Choose periSNOOP when a control loop is running and must keep running exactly as it is, but the value inside it should also reach the IP network.

periSNOOP 4-20mA

The periSNOOP 4-20mA joins an existing 4-20 mA sensor-to-PLC loop without changing the control system. The PLC keeps its program and reads exactly the signal it read before. periSNOOP publishes that same measured value to the IP network over Single Pair Ethernet, using the periCORE communication module.

Subject to property rights from patent file number:
102019126341.7
PCT/EP2020/077345

Field Network Interface

Type
Push-in terminal block for hybrid (data & power) cable assembly

Communication
100Base-T1 Single Pair Ethernet (IEEE 802.3bw)

Input Voltage
24VDC (+/-10%)

Power Consumption
1.1W

Sensor to PLC Interface

Type
Push-in terminal block
Signal
4-20mA

Housing

Material
Aluminium
Protection Class
IP65/67
Temperature Range
- 40°C...+ 85°C
Electromagnetic Compatibility (EMC)
Immunity for industrial environments
(EN 61000-6-2:2005, EN 61000-6-2:2005/AC:2005)
Emission standard for industrial environments
(EN 61000-6-4:2007, EN 61000-6-4:2007/A1:2011)
Compliance
CE, RoHS, WEEE
periSNOOP 4-20mA Product Summary
periSNOOP 4-20mA Datasheet
periSNOOP 4-20mA Quick Start Guide
PLC versus periSNOOP for Sensor Data Monitoring
Version
File
Changelog
Description
Version 6
periSNOOP 4-20mA
Changelog

The periSNOOP's no‐code firmware enables adaptation to 4‐20mA current loops through simple configuration changes instead of custom programming. It provides secure, IT‐ready sensor data and supports remote updates.

Order numbers and details

periSNOOP 4-20mA PRN.000.069 Single Pair Ethernet 4-20mA based sensor monitor

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+49 30 86 32 06 700