TX-I/O Modules
Local Override Feature
WARNING
Do not use the local override for safety shutdown operations, such as performing
service or maintenance. Use suitable emergency switches instead.
The local override feature is only available on certain I/O modules.
In principle, plug-in I/O modules with and without a local LCD panel/operator
controls are compatible and interchangeable.
Only outputs can be overwritten. Any attempt to overwrite an input results in an
error.
Local override also operates without a bus master, provided that the 24 Vdc
module supply is present and the address key is plugged in.
With a change from automatic mode to local override, the last state is retained The
TC Modular or TC-36 resumes control when the system is switched back to Auto.
The TC Modular or TC-36 is notified of local overrides and the associated values,
and they are permanently saved in the module.
Override Button
Pressing an override button in the middle enables or disables the local override (press
until the override status LED changes to ON or OFF).
When local override is enabled:
Pressing "+" increases an output value or activates the relay.
Pressing "–" reduces an output value or disables the relay.
Repeated or sustained pressure changes the value by several stages until the
function stops at the highest/lowest stage.
The I/O status LED and LCD display change accordingly.
Pressing "+" or "–" when local override is disabled results in an error.
10
Siemens Industry, Inc.
TALON TX-I/O Modules and Island Bus Technical Reference
588-587
CONFIDENTIAL: For internal use only
4/6/2010