System Monitor Function Blocks
The HC900 Controller includes function blocks that enable the user to monitor the status of system functions. When constructing a control configuration, add the following function blocks to the control strategy:
•ASYS - System Monitor
•FSYS - Fast System Monitor
•RK - Rack Monitor
These function blocks are described in the HC900 Function Block Reference Guide.
Master Control Relay
A Master Control Relay (MCR) structure is a safety mechanism for shutting down the process control system in emergency conditions. This mechanism, which is
Operating any of the
The Master Control Relay does not remove power from the Controller rack or from any of the I/O expansion racks.
•Before performing service tasks such as installation of terminal connections or fuse replacement, use the appropriate switch(s) to disconnect power from the power supply at each module.
•Ensure that wiring design precludes
Failure to comply with these instructions could result in death or serious injury.
Class 1, Division 2 Installations
•DO NOT REMOVE OR REPLACE MODULES WHILE CIRCUIT IS LIVE UNLESS THE AREA IS KNOWN NOT TO CONTAIN FLAMMABLE VAPORS.
Revision 5 | HC900 Hybrid Controller Installation and User Guide | 45 |
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