Limitorque Master Communication Module

Features and Benefits

The MVI56-LTQ module acts as an input/output module between the Limitorque valve network and the ControlLogix processor. The data transfer from the ControlLogix processor is asynchronous from the actions on the network. The 1500-word register space in the module transfers the valve information from the module to the processor. Ladder logic is responsible for control of the valves. Data transferred from the processor to the module instructs the module to execute commands to valves on the Limitorque network.

Applications

Industries and services that benefit from this integration include Aerospace, Chemical, Food/Beverage, Industrial Gases, Oil & Gas production, exploration, processing and refining, Mining, Pharmaceutical, Power, Pulp & Paper, Water/Wastewater.

Specifications

• Implements Limitorque’s Port A/B polling scheme using both ports on the LTQ module
• RS-232 or RS-485 communications (jumper selectable)
•  Software configuration (from processor ladder logic)
  – Baud rate: 1,200 TO 38,400
  – Message response timeout
  – Number of active slaves: 1 to 150
  – Last state on comm fail
  – Network polling scheme (looped, port 1 only, port 2 only)
  – Active slave table: bit mapped up to 150 slaves)

•  Supported commands
  – Continuously poll: read registers 40008 – 40013
  – Valve position
  – Status and fault registers
  -Digital outputs and digital
  – Inputs registers1 and 2
  – Communication error code and comm counter)

•  Commands
  – Open, stop, close, initiate network ESD, terminate network ESD, engage contactors 1 – 6, disengage contactors 1 – 6, valve position (0 – 100%))

• Support for the storage and transfer of up to 150 valves to the ControlLogix processor’s controller tags
• Emulates Limitorque’s Port A/B polling scheme using both ports on the module
•  Supports the following valves
  • MX/DDC Modbus
  • UEC-3-DDC Modbus
  • DDC-100M I/O module
  • DDC-100M field unit
  • Valvcon IVO (unit in multi-drop mode only)
•  Software configuration
  • Baud rate: 1200 to 115200
  • Message response timeout
  • Number of active slaves
  • Last state on communication failure for valve data
  • Network polling scheme
  • Active slave table (bitmapped)
  • Use of CTS module line option
  • Backplane failure effect on communication port availability
•  Support command
  • Continuously polled
  • Read registers 40008 to 40013, optional 40055 or 40006/40007
  • Commands: open, stop, close, initiate network ESD, terminate network ESD, engage contactors 1 to 6, disengage contactors 1 to 6, position valve (0 to 100%)
•  Data returned to the processor for each valve
  • Valve position
  • Status register
  • Fault register
  • Digital outputs
  • Digital inputs registers 1 and 2
  • Communication error code
  • Communication poll counter
  • Special polled registers