Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 29
Analog I/O Module Features Chapter 2
Elegant Migration Emulation Mode
The 1756 Isolated Analog I/O modules, which are 6-channel, have a migration
path to the 1756 Isolated Analog 8-channel modules. Table 2
shows the
relationship between the 6-channel modules and the 8-channel modules.
The migration catalog numbers, (1756-IF8I, 1756-IRT8I, and 1756-OF8I),
firmware revision 2.011 and later can communicate to the controller as if they are
6-channel modules. This Emulation mode lets a 6-channel module application
migrate to use the 8-channel module.
This migration means that when a forward open containing configuration data is
sent to the 8-channel module, it can accept it and respond as if it were a 6-channel
module. After the connection is established, all data (input and/or output) is sent
to/from the controller in the same format and tag structures as if it were a 6-
channel module. With this method, you can directly replace a 6-channel module
with an 8-channel module with no I/O tree modifications or program changes.
When an 8-channel module receives configuration data for a 6-channel module,
the 8-channel module takes that information and reformats it to replicate the
configuration data of an 8-channel module. The 8-channel module scans the
firmware but reformats the input and/or output data to match the 6-channel
module.
In general, the 8-channel module is internally behaving as an 8-channel module
because most of the firmware has not changed. The difference in 8-channel
module firmware is that in emulation mode, configuration, input, and output
data is reformatted to match the appropriate 6-channel module.
All data to/from an 8-channel module is mapped from a 6-channel module
format to an 8-channel module format. The controller still sends data in the
1756-IF6I module format but firmware internally moves data to the 1756-IF8I
module format.
Table 2 - 1756-Isolated Analog I/O Module Migration Descriptions
Catalog Number 1756 ControlLogix Isolated Analog I/O 6-channel
Description
Migration Catalog Number 1756 ControlLogix Isolated Analog I/O 8-channel
Description
1756-IF6I Isolated Analog Input-Current/Voltage 6 Pts (20 Pin) 1756-IF8I Analog Input Module, 8 Isolated Points, Current, Current
Sourcing and Voltage (36 Pin)
1756-IF6CIS Isolated Analog In-Current Sourcing 6 Pts (20 Pin)
1756-IT6I Isolated Thermocouple/Mv Input 6 Pts (20 Pin) 1756-IRT8I RTD / Ohms / Thermocouple / mV Input Module, 8
Individually Configurable Isolated Points (36 Pin)
1756-IT6I2 Enhanced Isolated Thermocouple/Mv Input 6 Pts (20 Pin)
1756-IR6I Isolated RTD Input 6 Pts (20 Pin)
1756-OF6VI Isolated Analog Output - Voltage 6 Pts (20 Pin) 1756-OF8I Analog Output Module, 8 Isolated Points, Current and
Voltage (36 Pin)
1756-OF6CI Isolated Analog Output - Current 6 Pts (20 Pin)
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