MVI56E-GEC ♦ ControlLogix Platform
Reference
Generic ASCII Ethernet Communication Module
User Manual
ProSoft Technology, Inc.
Page 59 of 80
Write Block
These blocks of data transfer information from the ControlLogix processor to the
module. The following table shows the structure of the output image used to
transfer this data.
Word
Offset
Description
0
Block Sequence Number (Read block number as set by module)
Transmit
Data
1
Server/Client Number for data to transmit. If the word contains a value
of -1, no transmit data is present. If the word contains a value from 0 to
maximum number of servers -1, the block contains data to send from
the specified server in the module. If the word contains a value from 10
to 14, then the block contains data to send from one of the clients.
2
Number of characters to transmit to a server or client. Each block can
transmit up to 400 bytes of data. If this word contains a value of -1, the
block contains 400 bytes of data and more blocks of data are to follow.
When the module received the last block containing a positive value
representing the number of bytes in the block, the server or client will
transmit the data to the end device.
3 to 202
Data to transmit on specified server or client.
Transmit
Control
203 to 212
Client connection request data.
213 to 235
Reserved for future use
236
Server[0] Control Word (1=Abort)
237
Server[1] Control Word (1=Abort)
238
Server[2] Control Word (1=Abort)
239
Server[3] Control Word (1=Abort)
240
Server[4] Control Word (1=Abort)
241
Client[0] Control Word
242
Client[1] Control Word
243
Client[2] Control Word
244
Client[3] Control Word
245
Client[4] Control Word
246
Server Control Word
247
Module Control Word contains a value of 0, -1, -2 or -3.
The Block Sequence Number is received on the last read block transfer through
the input image on the module. The ladder logic should copy this value from word
249 of the input image to word 0 of output image in the ladder logic.
Block ID
Description
0 to 65535
Normal data blocks for read and write
Note: This is the last operation performed when constructing the write block. The module’s
program will trigger the Process Write Block function when it recognizes a new value in word 0 of
the output image.
