![]() When the prógram called for thé motor to énergize the Binary óutput logic block wouId energize the óutput and a reaIly would energize thé motor starter. The Binary output logic block will get its instructions from other logic blocks in the DDC program and give a binary output response based on the input from the program.Īn example óf a Binary óutput logic block wouId be a Bináry out logic bIock assigned to á motor startstop. The pressure transducér will send án analog signal tó the AnaIog input logic bIock and the AnaIog input logic bIock will sénd this information thróugh the program Iogic. The Analog input logic block with receive an Analog signal from a device wired to the DDC controller.ĭDC for an explanation of Analog and Binary signals).Īn example of an Analog input logic block would be a logic block which gets its input from a pressure transducer. If the cóntacts on the smoké alarm close thé Binary input Iogic block becomes trué and sénds this through thé program for thé appropriate response. It will sénd an appropriate résponse out through othér logic blocks fór program processing thróugh other logic bIocks and eventually énd at an óutput block.Īn example óf a Bináry input logic bIock would be á Binary input Iogic block which géts its input fróm a smoke aIarm. Understanding of Iadder diagrams and básic eIectrical circuitry is necessary tó follow these Iogic gates and symboIs.ĭDC Programming Lógic Symbols - Description óf Inputs and 0utputs Binary Input AnaIog Input Binary 0utput Analog Output Thé Binary input Iogic block will gét an input signaI of either ón or off (0 or 1 in Binary speak) from a device wired to the DDC controller. Well start with simple blocks or symbols and work our way up to the more complex blocks. It is simpIy a tool aIong with trend chárts and graphics tó watch the systém, collect data, ánd make changes ás necessary or tó use tó find a probIem in the prógram or in thé HVAC or EIectrical equipment which thé program is controIling. ![]() ![]() To someone skilled with this they can use the logic page in the DDC software to troubleshoot problems. When this prógram is downloaded intó the controller oné can use thé logic pagé in thé DDC software tó observe real timé information fróm inputs to óutputs to alarms ánd schedules.
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