Operating Characteristics - Controller Modes
150 HC900 Process Controller Installation and User Guide Revision 19
06/14
Table 22 – Controller Operating Modes
Mode Name Functions in selected mode
RUN
I/O scanning (Controller and Expander Racks)
Function block execution; outputs are set according to function block algorithms.
Monitoring of Diagnostics (controller rack and I/O expander racks)
Detection of I/O Modules
Other functions permitted:
• Downloading of configurations
• Indications of Forces at Status LEDs on I/O modules
Other functions NOT permitted:
• AI calibration
• AO calibration
PROGRAM
I/O scanning (Controller and expansion Racks[C50 CPU only]) is performed, but
function blocks are not executed, and all outputs (digital and analog) are set to OFF.
(See Note 1.)
Monitoring of Diagnostics (Controller and Expander Racks)
Detection of I/O Modules
Other functions permitted:
• AI calibration
• AO calibration
• Downloading of configurations
• Downloading controller firmware (Program Locked or Program)
Other functions NOT permitted:
• Indications of Forces at Status LEDs at I/O modules
OFFLINE
IO scanning (Controller and Expander Racks) is performed, but function blocks are
not executed, and all outputs (digital and analog) are Frozen (see Note 2) at the
states they were in when the OFFLINE mode was selected.
Monitoring of Diagnostics (local and expanded racks)
Detection of I/O Modules
Other functions permitted:
• AI calibration
• Indications of Force at Status LEDs of I/O modules
Other function NOT permitted: AO calibration
Note 1: The Off state of the module outputs are defined as:
• Digital output - low state
• Time proportional Output (TPO) : 0% duty cycle
• PPO and TPSC Outputs: Both Fwd and Rev are Off.
• Analog output: 0.0 mA
Note 2: The Frozen states of module outputs are defined as:
• Digital output: same state as previous (last active state)
• Time Proportional Output (TPO): Same duty cycle as in last active state
• PPO and TPSC Outputs: digital outputs are Off to freeze the motor position.
• Analog output: same current as previous (last active current level)
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