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MVI56-CAS
♦
ControlLogix Platform
Reference
Teledyne CA Slave Module
Page 52 of 86
ProSoft Technology, Inc.
December 26, 2007
Data contained in this database is paged through the input and output images by
coordination of the ControlLogix ladder logic and the MVI56-CAS module's
program. Up to 248 words of data can be transferred from the module to the
processor at a time. Up to 247 words of data can be transferred from the
processor to the module. Each image has a defined structure depending on the
data content and the function of the data transfer as defined below.
5.2.2 Normal Data Transfer
Normal data transfer includes the paging of the user data found in the module's
internal database in registers 0 to 4999 and the status data. These data are
transferred through read (input image) and write (output image) blocks. Refer to
the
Module Set Up
section for a description of the data objects used with the
blocks and the ladder logic required. The structure and function of each block is
discussed below.
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 in
the following table:
Offset Description
Length
0 Reserved
1
1
Write Block ID
1
2 to 201
Read Data
200
202
Program Scan Counter
1
203 to 204
Product Code
2
205 to 206
Product Version
2
207 to 208
Operating System
2
209 to 210
Run Number
2
211 to 217
Port 1 Error Status
7
218 to 224
Port 2 Error Status
7
225 to 230
Data Transfer Status
6
231
Port 1 Current Error/Index
1
232
Port 1 Last Error/Index
1
233
Port 2 Current Error/Index
1
234
Port 2 Last Error/Index
1
235
Port 1 Status Scan
1
236
Port 2 Status Scan
1
237 to 248
Spare
12
249
Read Block ID
1
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