MVI56-LTQ Limitorque Valve Network Interface Module for ControlLogix

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.

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
   

• Valvcon IVO (unit in multi-drop mode only)

• DDC-100M field unit

• DDC-100M I/O module

• UEC-3-DDC Modbus

• MX/DDC Modbus

•  Software configuration
   

• Backplane failure affect on communication port availability

• Use of CTS module line option

• Active slave table (bit mapped)

• Network polling scheme

• Last state on communication failure for valve data

• Number of active slaves

• Message response timeout

• Baud rate: 1200 to 115200

•  Support command
   

• 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%)

• Read registers 40008 to 40013, optional 40055 or 40006/40007

• Continuously polled

•  Data returned to the processor for each valve
   

• Special polled registers

• Communication poll counter

• Communication error code

• Digital inputs registers 1 and 2

• Digital outputs

• Fault register

• Status register

• Valve position