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Chapter 3
I/O Memory Mapping
Alternate Mode (one channel
at a time) Output File
Table 5 - Alternate Mode (one channel at a time) Output File
W
O
R
15 14
13
12
11
D
(1)
0
Reserved
1
Reserved
2
Reserved
3
Reserved
4
5
6
7
8
Character 1
9
Character 3
...
Character ...
106
Character 197
107
Character 199
(1) Reserved is expected in 1st instance word 0.
(2) Tag name format is `Local:S:O' where 'S' represents slot number.
(3) Used for handshaking mode.
(4) Used for handshaking mode.
72
The alternate mode output file contains the real-time output data from the
module. This table shows the generic module tag definitions on the left. On the
right of the table is the 1769-ASCII module Add-On Profile configuration using
RSLogix 5000 software version 16 and later.
It is assumed that 16 bit words are used. The structure on the left is used with
varying data types; SINT, INT, BOOL and SINT array for data. The Add-On
Profile structures the module output, configuration and input tags differently.
With the Add-On Profile the configuration tags are rearranged as INTs.
The table shows the maximum size of the value and shows the maximum array
size for Alternate Mode.
Bit Position
10
9
8
7
6
5
4
Generic Module Tag Names
Tx Transaction ID Ch0
Rx Transaction ID Request Ch0
Tx Transaction ID Ch1
Rx Transaction ID Request Ch1
Reserved
Reserved
Reserved
Length (Number of Bytes)
Character 0
Character 2
Character ...
Character 196
Character 198
Rockwell Automation Publication 1769-UM012B-EN-P - January 2014
Add-On-Profile Tag
3
2
1
0
Name
Local:S:O.Ch0TxID
Local:S:O.Ch0RxID
Local:S:O.Ch1TxID
Local:S:O.Ch1RxID
CNI
Local:S:O.RxChNumber
CNO Local:S:O.TxChNumber
Local:S:O.TxDataLength
Local:S:O.TxData
Local:S:O.TxData
Local:S:O.TxData
Local:S:O.TxData
Local:S:O.TxData
Description
(2)
Transmit Transaction ID.
(3)
Receive Transaction ID Request. Used with
Ch1RxID for handshake mode.
Transmit Transaction ID.
(4)
Receive Transaction ID Request. Used with
Ch0RxID for handshake mode.
Channel number of requested input data.
This bit is set by the PLC controller or
other user program to tell the 1769-ASCII
module which data to produce.
This bit is set by the controller based on
the user program; same for all the words
in the Output data file
Channel number of the output data being
sent. This bit is set by the PLC controller or
other user program to tell the module
which port's data is being sent to the
1769-ASCII module.
The amount of data being transmitted.
This defines the transmit ASCII character
for the tag.
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