Monitoring

Environment, building equipment, industrial sites and ITsystems, as well as utilities, need to monitor their environment and operational conditions reliably and efficiently. An overview of selected variables such as temperature, pressure, dew point, lighting level, air quality, machine operation or vibration, provide a comprehensive picture of the state of the equipment and enable the operator to respond appropriately.

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Application note 42: 0-20mA or 4-20mA current loop

When using LAN and GSM sensors by HW group, it is important to understand the difference between a 0..20mA current loop and a 4..20mA current loop. This Application Note explains the difference.

Features: 
  • The output unit format is configurable in HW group converters. The subsequent Ares or Poseidon2 unit can then, for example, display the water level as “38 cm” instead of the “17 mA” raw value.
  • The input to output value conversion using a curve with up to 8 points can be stored directly into the “Sensor 4-20mA 1W-UNI” or “Sensor 0-20mA 1W-UNI” converter.
  • To monitor sensors over GSM, the Poseidon2 unit can be replaced by an Ares unit.
  • Caution: This application note only concerns the analog value. It does not apply to digital communication over the current loop.

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The SNMP v3 is now supported in all the Poseidon2 units

The SNMP v3 is now supported in all the Poseidon2 units. This is a major update that brings many advantages and improvements. The following text will explain all the advantages of the SNMP v3 and how to use it in the Poseidon2 devices.

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Modbus/TCP in Poseidon2 and Damocles2 family

Modbus is a communication protocol designed for measuring devices that communicate over RS-485 or RS-232 (sometimes named Modbus RTU). The Modbus protocol itself allows to share the memory area for variables, e.g. the readings, over one of the physical interfaces. Modbus/TCP is an extension of this protocol for communication over Ethernet.

 

Its advantages include easy implementation in industrial visualization systems.

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Examples of using Poseidon Industrial Bus

The application example details the use of the Industrial Bus (RS-485) for connecting sensors to a Poseidon2 4002 unit. It describes in detail the wiring of cables and connectors, as well as the DIP switch settings for supplied accessories.

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Poseidon – hysteresis - Preventing false alarms

Poseidon monitoring unit sends SMS, e-mail, and SNMP traps whenever a sensor value is outside of a safe range. However, when the temperature or humidity fluctuates, the unit can send tens or hundreds of messages that are unnecessary and bother the user. AN35 describes ways of avoiding false alarms.

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Electricity consumption metering

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Poseidon 4002 – Rack Monitoring System

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Remote energy monitoring with ABB DELTAMax M-Bus meters

Case study showing how to connect ABB M-Bus power meters to the Ethernet. Tested with DHM13007 and DBM23000 three phase ABB M-Bus meters. The ABB ODIN meters family (1 or 3 phase) is also supported with the OA1408 serial to M-Bus converter. You can read values remotely over SNMP or Modbus/TCP protocols. Web interface, SMS alerting and e-mail reporting available. The HWg-PWR 25 smart gateway is used to connect M-Bus to the network.

Features: 
  • Simple way of connecting ABB DELTAMax or ABB ODIN meters to the network for remore energy consumption monitoring.
  • ABB Deltamax meters can be mixed with other M-Bus meters (even with water meters, gas meters, etc.)
  • Up to 3 / 12 / 25 M-Bus meters can be connected to a single HWg-PWR 3/12/25 smart ethernet gateway.
  • ABB ODIN pulse electricity meters can be connected using the OA1408 serial to M-Bus converter.
  • Can work even as a stand-alone solution. The HWg-PWR periodically sends reports for a given period.

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