Communication Format Support Between 6- And 8- Channel Modules; Modules; Electronic Keying - Allen-Bradley 1756 Reference Manual

Chapter 4 Application Conversion
Communication Format
Support Between
6- and 8-channel Modules

Electronic Keying

22
To update an 8-channel module with an 8-channel module owner connection,
the owning connection must be in Program mode.
When used in Emulation mode, the 8-channel modules do not support the
automatic firmware update feature of RSLogix 5000® software.
Each of the 6-channel modules had multiple types of communication formats
that could be selected. The 8-channel modules support all possible
communication formats. Also any version of RSLogix 5000 software can now
support the 8-channel modules as long as the 8-channel module is used in 6-
channel Emulation mode. If you are currently using a 6-channel module, it can
be directly replaced with an 8-channel module with no I/O tree modifications
or program changes. If necessary, wiring or removable terminal block (RTB)
changes can be made and are covered later in this document.
If you have an older system that does not inherently support the 8-channel
modules (RSLogix 5000 software V17 and earlier) and you must add
additional new I/O, you can now use 8-channel modules. You can use these
modules by selecting the 6-channel equivalent module in the I/O tree.
In all cases of using an 8-channel module in 6-channel Emulation mode, only
the 6-channel modules functionality is available. For example, 8-channel
modules can scan all channels as fast as 1 ms but in 6-channel Emulation mode
all channels can only be scanned at the rate specified by the 6-channel module.
IMPORTANT When 8-channel modules are used in 6-channel Emulation mode, only six
(channels 0...5) of the eight channels are functional. Channels six and
seven of the 8-channel module cannot be used.
When using Emulation mode, we recommend that you select Compatible
Keying as your electronic keying option.
Exact match as an electronic keying selection does not work. The connection
will error with, "(Code 16#0116) Electronic Keying Mismatch: Major and/or
Minor revision invalid or incorrect."
The use of Disable Keying is not recommended.
ATTENTION: Be extremely cautious when using Disable Keying; if used
incorrectly, this option can lead to personal injury or death, property
damage, or economic loss. We strongly recommend that you do not use
Disable Keying. If you use Disable Keying, you must take full responsibility for
understanding whether the device being used can fulfill the functional
requirements of the application.
Rockwell Automation Publication 1756-RM011A-EN-P - June 2016