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# Digital output control strategies

Some controllers support the use of digital outputs as destination addresses. However, this functionality may have unintended consequences.

Digital outputs are typically controlled by the controller Also known as remote terminal unit, RTU. A generic term for a device that is used to control and monitor one or more processes in field equipment. The most common control and monitoring device in an access control and security system is an access control panel. Other devices include security monitoring panels, elevator controllers, and fire monitoring devices. Controllers include programmable logic controllers (PLCs), loop controllers, bar code readers, and scientific analyzers. See also: C200 controller, control processor, CPM, hybrid controller, network node controller, PLC. itself. If you use a digital output in a destination address, the server The computer on which the Experion database software and server utilities run. See also: Experion server TPS. value will always override the value the controller expects to use. Once the output has been forced by the server, control cannot be returned to the controller. (that is, the server value will always have precedence).

Because of this potential problem, the use of the digital output as a destination address has been disabled for the UMC800. Instead, if you have a control strategy as shown below, rather than use 'Digital Output' as the destination of a server point parameter Also known as parameter. A unit of information about a point. For example, an analog point includes parameters such as process variable parameter (PV), output parameter (OP) and setpoint parameter (SP). See also: analog point, output parameter, point, process variable, setpoint parameter., use the strategy shown in below. This strategy uses two server destination addresses, Force Value and Force Enabled. Force Enabled enables you to switch A multiport device that moves Ethernet packets at full wire speed within a network. A switch may be connected to another switch in a network. See also: Ethernet, network. between the local value, Calculated Value, and the server value, Force Value.

Figure 3-1: Digital Output Control Strategy - Example 1

Figure 3-2: Digital Output Control Strategy - Example 2