Matrix-orbital LK162-12 Legacy Bedienungsanleitung PDF herunterladen (Seite 12)

LK162-12 rev 4

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C please visit…

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2.2 General Purpose Outputs

The LK162-12 has seven general purpose outputs. These are provided to control relays or other electronic

devices. This allows external devices to be turned on or off using your PC or controller and software

commands. (See sections 6.1.7 and 6.1.8 for the command syntax.)

Each output is wired as shown in Figure 2-8. The + terminal is connected directly to the module positive

supply, the – terminal is connected through a 240 ohm current limiting resistor and the electronic switch to

ground.

Figure 2-8 General Purpose Outputs

Maximum allowable current is 20mA, which is enforced by the current limiting resistor. If the device being

switched has a resistance of 240 ohms or more the corresponding resistor may be shorted.

Note: The GPOs do not have any over current or over/under voltage protection so care must be taken when

using them. For instance if the external device is a relay it must be fully clamped (using a diode and

capacitor) to absorb any generated back electro-motive force (EMF).

10 - 100 u

1N400 1

Re lay

coil

GPO

Figure 2-9 Clamping a Relay

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Matrix-orbital LK162-12 Legacy Bedienungsanleitung Seite 12