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Mounting structure in which various input/output modules are installed
IO housing
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A protective method of setting an IO card and rack slot to accept a particular card type only
keying
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A printed circuit board, typically at the rear of an IO rack, having plug-in bus connectors into which modules are installed
backplane
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Mane given to IO components that enables the PLC to accept information from connected devices
input modules
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Name given to IO components that enables the PLC to send control information to connected devices
output modules
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The class of IO modules used to interface the PLC to devices that involve ON/OFF type signals
discrete IO
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Class f IO modules that interface the PLC to devices involving continuous current or voltage signals
analog IO
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A class of IO modules that perform special preprocessing functions independent of the CPU
intelligent IO
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IO configurations that involves IO places in the same housing as the CPU or that is limited to placement within a short specified distance from the CPU
local IO
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IO configuration that allows IO housings to be placed at long distances from the CPU
remote IO
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IO module feature that guard the PLC against damage that might be cause by field voltages
isolation
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Name given to the various modules used to configure local and remote IO interconnections to the CPU
IO processor modules
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IO addressing method in which the addresses n each module are based purely on the exact placement of the module within the IO housing
fixed-slot addressing
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Refers to the one-to-one correspondence between specific memory addresses and the addresses of physical IO terminals
IO mapping
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IO addressing method in which each modules addresses are user-configured, via hardware or software
variable-slot addressing
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The address of the first of one or more consecutive words used to store the IO data of a given module
starting word address
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IO addressing method in which the addresses of each module are based on both the IO housing and a lot in which the module is placed
rack-based addressing
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The means through which physical connection is made between the field devices and the CPU
input/output systems
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System component that converts the main supply voltage to internal DC voltages required by the IO modules
IO power supply
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Term given to any one f several distant locations from the CPU, at which clusters of IO racks are placed
remote drop
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Numbers used in the control program to reference specific input devices, output devices, or memory locations
IO addresses
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