I/O Expansion Module Overview
10
HMC3000 Series I/O Module Guide
10
Common Terms and Definitions
This section defines some common terms used to describe various types of inputs and outputs. The terms
explained below are generic descriptions. Be sure to consult the datasheet for the specific requirements when
installing and wiring a module.
Digital Inputs and Outputs
Digital inputs provide physical connections and interpretations of input devices using discrete signals. The input
is represented in the PLC input registers as a 1 for the on state and 0 for the off state. Each digital input terminal
is associated with an internal Input Coil (X) in the tag database of the HMC3000. Similarly, each digital output
terminal is associated with an Output Coil (Y).
Analog Inputs and Outputs
Analog inputs provide physical connections and interpretations of input devices using analog signals. The input
range depends on the type of input device. Configure analog inputs to work with current or voltage sources.
Each analog input terminal is associated with an internal Input Register (XW) in the tag database of the
HMC3000. Similarly, each analog output terminal is associated with an Output Register (YW).
Sinking versus Sourcing
These terms refer to the type of digital inputs or outputs used. A sourcing I/O provides a voltage source, and a
sinking I/O provides a ground. Any module that is not bidirectional (meaning current can go in either direction)
requires that the circuit conduct current in a specific direction. In order to have current flow, each I/O terminal
on the expansion module must have a return path or a signal ground connection. In most modules, multiple I/O
terminals share the signal ground connection.
For a sourcing module, the current flows out of the expansion module terminal and into the common (signal
ground) terminal. The term source indicates the terminal on the expansion module provides the current to the
switch contact or load.
For a sinking module, the current flows into the expansion module terminal and out of the common terminal on
the I/O module. The term sink indicates the terminal takes in the current from the switch contact or load.
Note: Arrow indicates current flow direction
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