ProSoft Technology MVI56-LTQ - Manual (Page 32)

Ladder Logic MVI56-LTQ ♦ ControlLogix Platform
User Manual Limitorque Valve Actuator Master Communication Module
Page 32 of 98 ProSoft Technology, Inc.
August 30, 2010
3.1.2 User Data Objects
These objects hold data to be transferred between the processor and the MVI56-
LTQ module. The first user data object is the LTQBackplane object that contains
the variables required by the ladder logic program for data transfer between the
module and the processor. The following table describes the structure of this
object.
Name Data Type Description
LastRead INT Index of last read block
LastWrite INT Index of last write block
BlockIndex INT Computed block offset for data table
Values in this structure are used by the ladder logic and initialized by the power-
up function. The values in this block should change very rapidly as the transfer
process is very fast.
The last set of user data is shown in the following illustration:
Name Data Type Description
Valve LTQValve[150] Valve data
DoneBits INT[10] Done bit data for commands
Open INT[10] Open Command bits
Stop INT[10] Stop Command bits
Close INT[10] Close Command bits
InitESD INT[10] Initiate ESD bits
TermESD INT[10] Terminate ESD bits
Reset INT[10] Reset Command bits
Contactors LTQCont[6] Contactors #1 to #6 engage/disengage bits
AnalogCmd INT[10] Command valve to set analog position bits
AnalogPos INT[150] Analog valve positions (0-100) to be used for
set cmd
The value array stores data transferred from the module to the processor. The
following table describes the structure of each element in the array.
Name Data Type Description
ValvePos INT Position of valve 0-100%
Status INT Status Register BIts
Fault INT Fault Register Bits
DOut INT Digital Output Bits
DIn1 INT Digital Input 1 bits
DIn2 INT Digital Input 2 bits
ComStatus INT Communication Status Code
ComCntr INT Communication poll counter (0-32767) for
success
SPoll1 INT Special polling register #55
SPoll2 INT Special polling register #6 and #7
SPoll3-SPoll65535 INT Special Polling register #3 to #65535