MultiSmart Installation & Operation Manual
7.3.2 Digital Inputs
There are 20 digital inputs on the Pump Control I/O (3PC) board. All inputs can be used as volt-free digital
inputs, but also have additional functionality. An example of the digital input wiring follows.
Figure 40 – Digital Input Wiring Example
WARNING:
THE DIGITAL INPUTS ARE VOLT-FREE INPUTS. DO NOT APPLY ANY SOURCING VOLTAGE TO THEM.
7.3.2.1 Sensor Types
The digital inputs are configured through the interface to accept many types of inputs. For example:
• Flygt FLS (thermal & seal)
• Thermal Switch
• Voltage Free Contact (switch or relay)
• Transistor (inc. opto-coupler)
• Conductive Probe
• Conductive Seal
• Thermistor (non-linear PTC)
• Counters
Certain DINs have added capability:
• DI 19-20 High speed inputs (up to 1 kHz).
Used for high speed pulsed inputs such as Pulse Flow Meters.
• DI 16-18
These three inputs can be used with Flygt CLS (Capacitive Leakage Sensors)
• DI 1 Fail-Safe probe input.
Used to connect the failsafe sensor wire from a MultiTrode Failsafe probe.
All the above inputs can be used as general purpose digital inputs.
MultiSmart_IO_Manual_R20 Page 45 of 260
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