ProSoft Technology MVI56-LTQ - Manual (Page 61)

MVI56-LTQ ♦ ControlLogix Platform Reference
Limitorque Valve Actuator Master Communication Module User Manual
ProSoft Technology, Inc. Page 61 of 98
August 30, 2010
Normal data transfer includes the paging of the valve data found in the module’s
internal database in registers 0 to 1499, the status data and the done bit data
from the module to the processor. These data are transferred through read (input
image) blocks 0 to 7. Data transferred from the processor to the module is
through blocks 0 and 1. The structure and function of each block is discussed in
the following topics.
Normal Data Transfer
Read Block
These blocks of data transfer information from the module to the ControlLogix
processor. The structure of the input image used to transfer this data is shown
below:
Word Description
0 Reserved
1 BTW ID Requested (0 or 1)
2 to 201 Valve Data (20 valves each block)
202 to 211 Done Bit Data
212 to 213 Product Code
214 to 215 Revision
216 to 217 Operating System
218 to 219 Run Number
220 Pass Count
221 Queue Size
222 BTR Count
223 BTW Count
224 BT Parse Count
225 BT Event Count
226 BT Error Count
227 Current Slave
228 Current Port
229 Alt Port
230 Special Poll Request
231 State
232 Comm State
233 CfgErr
234 to 248 Spare
249 BTR ID (0 to 7)
The Read Block ID is an index value used to determine the location of where the
data will be placed in the ControlLogix processor controller tag array of module
read data. Each transfer can move up to 200 words (block offsets 2 to 201) of
data representing the data for up to 20 valves. In addition to moving valve data,
the block also contains status data for the module. This last set of data is
transferred with each new block of data and is used for high-speed data
movement.