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Technical Bulletin—TC-9100 Universal Controller
To use the Startup mode, Programmable Module 1 must be configured as
the main control module, and the range of the sensor connected to the
process variable must be selected such that 5% of the range represents the
control deviation which cancels the Startup mode. For example, if a
sensor range of 0 - 40°C was chosen, and the control set point is 20°C in
a heating controller, the Startup mode would be canceled at 18°C.
Each programmable module may be set to Hold mode by the supervisory
system. In Hold mode, the output of the module (OCMn) may be written
(overridden) by the supervisory system. When the Hold mode is reset, the
output is again calculated by the programmable module. The Metasys
Network System and Companion System automatically set and reset the
Hold modes when the outputs are adjusted and released. The Hold modes
are not canceled when the supervisory system fails to update the
Supervisory System Active Refresh Bit, but they are canceled by a power
failure to the controller.
If the programmable module is configured as a heating/cooling controller
(algorithms 3 to 6), both the heating (Loop 1) and cooling (Loop 2)
controllers are put into Hold mode when either the heating (Loop 1)
controller or the cooling (Loop 2) controller is set to Hold mode. For
single output algorithms 3 and 4, only the output of Loop 1 may be
modified, and the output of Loop 2 will follow automatically. For dual
output algorithms 5 and 6, the outputs of loops 1 and 2 may be modified
independently.
Each programmable module configured as a controller algorithm may be
set into Computer mode by the supervisory system. In Computer mode,
the Working Set Point (WSP) of the module must be continuously set by
the supervisory system. When the Computer mode is reset, the working
set point is again calculated by the control algorithm. The Computer
mode is canceled when the supervisory system fails to update the
Supervisory System Active Refresh Bit, and is also canceled by a power
failure to the controller.
If the programmable module is configured as a heating/cooling controller
(algorithms 3-6), both the heating (Loop 1) and cooling (Loop 2)
controllers are put into Computer mode when either the heating controller
or the cooling controller is set to Computer mode.
When any parameter is changed by a Service Module (SM-9100)
connected to the controller, the Maintenance Started and Stopped bits are
set. If a new configuration is downloaded into the controller from a
Service Module, the Maintenance Started Bit is set at the beginning of the
download, and the Maintenance Stopped Bit is set at the completion of
the download. These bits may be read by the supervisory system to
indicate that configuration or parameter changes have taken place. A
special command is available to reset the Maintenance bits from the
supervisory system.
Hold Mode
Computer Mode
Maintenance
Indications
