Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 66)

Publication 1756-UM528A-EN-P - April 2004
5-14 Using the Sequence of Events Module Features
Table 5.4 describes the keying options available with your module.
Table 5.4
Keying option: Definition:
Exact Match All of the parameters listed above must match or the inserted module will reject a connection to the
controller.
Compatible Module The Compatible Match mode allows a Sequence of Events module to determine whether it can emulate the
module defined in the configuration sent from the controller. With Sequence of Events modules, the module
can emulate older revisions. The module will accept the configuration if the configuration’s major.minor
revision is less than or equal to the physical module’s revision.
For example, if the configuration contains a major.minor revision of 1.7, the module inserted into the slot must
have a firmware revision of 1.7 or higher for a connection to be made. When a module is inserted with a
major.minor revision that is less than the revision for which the slot is configured (i.e., the module has a
revision of 1.6 and the slot is configured for a module with revision 1.8), no connection is made between the
controller and the I/O module.
TIP
We recommend using Compatible Match whenever possible. Remember, though, with
major revision changes, the module only works to the level of the configuration.
At the time of this printing, the Sequence of Events module uses a major revision
of 1.3
(1)
However, if a new major revision for the module is released, consider this
example. If a slot is configured for a module with major.minor revision of 1.7 and you
insert a module with a major.minor revision of 2.3, the module works at the 1.7 level,
with respect to module functions that are related to RSLogix 5000 such as interface
changes. Bug fixes that are affected by the module’s firmware, though, would work at
the 2.3 revision level.
If possible, we recommend that you make sure configuration is updated to match the
revision levels of all I/O modules, including your Sequence of Events module. Failure to
do so may not prevent the application from working but may defeat the purpose of
upgrading your modules’ revision levels.
Disable Keying The inserted module attempts to accept a connection to the controller regardless of its type.
ATTENTION
Be extremely cautious when using the disable keying option; if used incorrectly, this
option can lead to personal injury or death, property damage or economic loss.
If keying is disabled, a controller makes a connection with most modules of the same type as that used in the
slot configuration. For the ControlLogix Sequence of Events module, if keying is disabled, the controller will
only make a connection to another Sequence of Events module.
A controller will NOT establish a connection if any of the following conditions exist, even if keying is disabled:
• The slot is configured for one module type (e.g. input module) and a module of another type (e.g. output
module) is inserted in the slot.
• The module inserted into the slot cannot accept some portion of the configuration. For example, if a
Sequence of Events module is inserted into a slot configured for a diagnostic input module, the
controller cannot make a connection because the module will not accept/process the diagnostic
configuration.
(1)
Minor revisions are incremented by single counts such that minor level 10 (i.e., major.minor revision level = 1.10) follows minor revision level 9 (i.e., 1.9).