Contents
MVI69-GEC ♦ CompactLogix or MicroLogix Platform
User Manual
Page 60 of 86
ProSoft Technology, Inc.
February 18, 2014
Word
Offset
Description
Received
Data
1
Server Number for data received. If the word contains a value of -1, -2,
-3 or -4, no receive data is present and the block contains status data. If
the word contains a value from 0 to 4, the block contains data from one
of the servers in the module.
Word 1 value
Description
-1
State of servers 0, 1 and 2
-2
State of servers 3 and 4
-3
State of clients 0, 1 and 2
-4
State of clients 3 and 4
2
Number of characters (0 to 110) in receive block (3 to 57). If the receive
data in the module is larger than 110 bytes (55 words), multiple blocks
will be transferred. Any block with a value of -1 in this field represents
the first or continuation block and the block contains 110 bytes (55
words) of data. The last block of data will contain a positive number in
this field that represents the number of characters in the last block.
3 to 57
110 bytes (55 words) of data received for specified server.
58
Server 0 State
59
Server 1 State
60
Server 2 State
61
Server 3 State
62
Server 4 State
63
LSB: Number of characters processed from last write block.
MSB: Index of the C/S that requested the write (0 to 4, 10 to 14, or
0xFF).
The Block Sequence Number (word 0) is an index value used to signal to the processor that
a new block is ready for processing. The ladder logic must recognize a change in this value
and process the data encapsulated. If data is available for a server, a block containing data
received is passed to the processor. The value at word 1 in the block contains the server
index (0 to 4) that is sending the data to the processor. Word 2 of the input image
determines the number of characters (or bytes) in the data area of the block. If the server
receives a message longer than 110 bytes (55 words), it must send the received message in
multiple blocks to the processor. In this case, the byte count field of the block will be set to -
1 for each block where more than 110 characters are being sent by the server. Each block
with a byte count field of -1 contains 110 bytes (55 words) of data. The data set is located in
the block starting at word offset 3. When the last block of data to send by the server is less
than or equal to 110 bytes (55 words), the byte count field will be set to a number from 1 to
110. This signifies to the processor that this is the last block. The ladder logic must handle
data received on each server enabled in the module.
If no data is available, the module will page one of the two status data images to the
processor. If word 1 of the Input Image block is set to -1, the data for the first three servers,
the product and block transfer data is sent in the block. The format of this block is as follows:
Object In
GECInStat
Block Offset
Start
Description
Seq Number
0
Sequence number for this block.
