I/O Expansion Module Overview
11
HMC3000 Series I/O Module Guide
11
Digital Outputs (PNP or NPN type)
The output terminals of a digital I/O module use an optically isolated PNP or NPN transistor to energize the
connected load. PNP/NPN outputs are faster than relay outputs but can only work with low current DC loads
(typically 500mA max per terminal). PNP modules are sourcing modules, and NPN modules are sinking modules.
PNP-type connection (Source)
NPN-type connection (Sink)
Note: the above diagrams show that a PNP output is ‘sourcing’ current and the NPN output is ‘sinking’ current
.
Digital Outputs (Relay type)
The output terminals of a relay-type digital module typically control loads that require an AC power source:
Use a Relay Output module to connect a DC load that requires more current than the maximum available when
using a PNP or NPN output. For AC loads, each relay output contact can handle up to 230VAC with a 2A load per
contact. For DC loads, each relay output contact can handle a 2A load per contact for up to 30VDC.
Analog Voltage
Analog voltage inputs can measure DC voltage ranges of 0-5 and 0 to 10 volts. With analog inputs, the analog
module writes a data value to the assigned register (XW) based upon the measured DC voltage at the input.
Analog outputs can provide 0 to 5VDC and 0 to 10 VDC with a minimum resistance of 1000 ohms depending
upon the value in the assigned register (YW). Input resolution is 16-bits and Output resolution is 12-bits.
Analog Current
Analog current inputs can measure DC current ranges from 0 to 20mA and 4 to 20mA. With analog inputs, the
analog module writes a data value to the assigned register (XW) based upon the measured DC current at the
input. The analog outputs can provide 0 to 20mA and 4 to 20mA. Analog outputs can deliver a DC current of up
to 20mA to a load with a maximum resistance of 500 ohms based upon the data value in the assigned register
(YW). Input resolution is 16-bits and Output resolution is 12-bits.
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