By R. Pance
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Additional resources for Energy Management Systems and Direct Digital Control
If a station (for example, a printer) never originates communications, it will be a terminate-only station and need not be in the polling sequence. If a station needs a high priority, it can appear more than once in the polling sequence. S. is the Attached Resource Computer Network, ARCNet, developed by Datapoint Corporation. Figure 6-2. Token Passing Ring Initially, the network and protocol were kept proprietary, but the data link protocol, interface specs, and even integrated circuits were made publicly available in 1982.
Since DDC integrates temperature control and energy management in the same system, comfort consideration can be incorporated into more sophisticated energy management programs, such as demand limiting by temperature and duty cycling within deadband setpoint. Advanced control functions are available with the microprocessor. A prime example would be calculating minimum percent outside air, using outdoor, return, and mixed air temperature sensors. Large energy savings can be realized in this way, since almost all other control systems invariably use too much outside air.
In this case the output pressure ranges were adjustable but the output value did not reflect setpoint or position. The controlled variable was the only indication of setpoint or position. ADVANTAGES The decision to use DDC can be based on the expected value of both energy and labor cost savings. DDC saves significant energy dol©2002 by The Fairmont Press lars through accurate control and by maintaining setpoint adjustments that do not change with time. Since DDC integrates temperature control and energy management in the same system, comfort consideration can be incorporated into more sophisticated energy management programs, such as demand limiting by temperature and duty cycling within deadband setpoint.