Modbus Dual Inputs

  • In its most basic form, the PDW90 consists of field units (up to 32) that accept 4-20 mA signals and transmits them wirelessly to a base station. The primary advantage of this system is how simple and economical it is to get multiple signals (not just 4-20 mA, also discrete (digital) and Modbus) from where you have them to where you need them – all without having to run wires!

    The wireless communication between the field units and the base station is bi-directional. That means you can send 4-20 mA, discrete and Modbus signals from the field units to the base station and also send completely different 4-20 mA, discrete and Modbus signals from the base station to the field units. For instance, the field unit could send a 4-20 mA signal to the base station corresponding to the level in a tank and the base station could send a 4-20 mA sig-nal to the field unit to control a valve.

    Field units are also equipped with four digital I/O that can each be independently programmed as an input or an output. A Loss of Signal warning is also available by connecting devices to the G and LS screw terminals.

    To indicate alarm situations in the field, the field unit can be equipped with an optional, field installable, two relays module. These relays are rated Form A (SPST) 5A and are controlled by the digital outputs on the base station.

    The base stations are available in configurations for 2, 6, or 16 I/O slots for a variety of field installable I/O modules. The available I/O modules are:

    • •Dual Analog Input
    • •Dual Analog Output
    • •Dual Relay Output
    • •Four Digital I/O

    The specified range between the base station and field units is 1 mile line-of-sight outdoor and 500 feet indoor and repeaters are available to extend the range. A low-cost wireless survey tool, Model PDA10, is available to test the signal strength of your application before you buy. And if the PDW90 system does not work in your application, you can return it for full credit!

  • The ProtEX-MAX PD8-6080 Super Snooper Modbus scanner offers all the functionality of the ProVu PD6080 as a CSA, ATEX, and IECEx certified explosion-proof product. It is available in an aluminum or stainless steel enclosure and will operate over a wide temperature range of -55 to 65°C (-67 to 149°F). It is a multi-purpose display and controller capable of scanning up to 16 process variables and includes dual analog process inputs. The scanner can be programmed as a Modbus RTU master, slave, or snooper. It is the ideal display for Modbus multivariable transmitters or for existing Modbus networks with transmitters in need of a conveniently located display in a hazardous area. As a master, the PD8-6080 can read up to 16 Modbus registers on up to 16 Modbus devices and automatically alternate each of these process variables (PVs) on the dual-line display along with a unit and tag for each. In snooper mode, the scanner can read any Modbus variables being polled by a master, which allows you to easily add a display into an existing Modbus network. Powerful math functions may be applied to the analog or Modbus inputs, such as addition, difference, average, and ratio. The PD8-6080 can be equipped with four internal relays and a 4-20 mA output. It can be programmed and operated without opening the housing by using the built-in CapTouch through-glass buttons.

  • The ProtEX-MAX PD8-6081 Super Snooper feet & inches Modbus scanner offers all the functionality of the ProVu PD6081 as a CSA, ATEX, and IECEx certified explosion-proof product. It is available in an aluminum or stainless steel enclosure and will operate over a wide temperature range of -55 to 65°C (-67 to 149°F). It displays level information on a specially designed feet & inches display, instead of the usual decimal format. It is the ideal display for hazardous areas with Modbus level or multivariable transmitters and is capable of scanning up to 16 process variables. Its unique feet & inches upper LED display can indicate up to 99 feet, 11 and 15/16 inches. The 6-digit lower display can indicate units, tags, or other variables such as volume, temperature, or density. The PD8-6081 also has dual analog inputs, for integrating traditional 4-20 mA or voltage inputs in the display scanning. The scanner can be setup as a Modbus master, slave, or snooper. Various math functions may be applied to the analog or Modbus inputs, such as addition, difference, average, and ratio. The PD8-6081 can be equipped with four internal relays and a 4-20 mA output. It can be programmed and operated without opening the housing by using the built-in CapTouch through-glass buttons.

    Why you should buy:
  • The ProVu PD6080 Super Snooper Modbus® scanner is a multi-purpose display and controller capable of scanning up to 16 Modbus process variables and accepts two analog process inputs. The scanner can be programmed as a Modbus RTU master, slave, or snooper. It is the ideal display for Modbus multivariable transmitters or for existing Modbus networks with transmitters in need of an easy-to-read and conveniently located remote display. As a master, the PD6080 can read up to 16 Modbus registers on up to 16 Modbus devices and automatically alternate each of these process variables (PVs) on the dual-line display along with a unit and tag for each. In snooper mode, the PD6080 can read any Modbus variable being polled by a master, which allows you to easily add a display into an existing Modbus network. Like all ProVu meters, the PD6080 includes UL / C-UL listing and CE marking, a NEMA 4X front, and AC or DC power options. Powerful math functions may be applied to the analog or Modbus inputs, such as addition, difference, average, and ratio.

    Why you should buy:
  • The ProVu PD6081 Super Snooper feet & inches Modbus® scanner displays level information on a specially designed feet & inches display, instead of the usual decimal format. It is the ideal display for Modbus level or multivariable transmitters and is capable of scanning up to 16 Modbus process variables. Its unique feet & inches upper LED display can indicate up to 99 feet, 11 and 15/16 inches. The 6-digit lower display can indicate units, tags, or other variables such as volume, temperature, or density. The PD6081 also has dual analog inputs, for integrating traditional 4-20 mA or voltage inputs in the display scanning. The PD6081 can be setup as a Modbus master, slave, or snooper. Like all ProVu meters, the PD6081 includes UL / C-UL listing and CE marking, a NEMA 4X front, and AC or DC power options. Various math functions may be applied to the analog or Modbus inputs, such as addition, difference, average, and ratio.

    Why you should buy:
  • Go with the Helios PD2-6080 when you have multiple, (up to 16), Modbus registers you want to display on a single large display meter. The PD2-6080 can also accept two 4-20 mA signals. The PD2-6080 can be programmed as a Modbus RTU Master, Slave or Snooper allowing it to work in just about any Modbus application. Typically, the upper line displays the PV and the lower line displays the tag.

     

     

     

     

    Why you should buy:
  • Go with the Helios PD2-6081 when you have a level application involving Modbus signals and you prefer to display in feet and inches instead of the more common decimal format. The PD2-6081 can display up to 16 modbus registers so a typical application might be 16 tank levels, 8 tank levels and 8 interface levels, or 5 tank levels, 5 interface levels and 5 temperatures. The PD2-6081 makes a great outdoor tank side indicator because its display is bright enough to read in direct sunlight and it will operate from -40 to 150°F.

     

     

     

    Why you should buy: