Technical Manual &
Cabling Instructions
Page 19 / MAN000596
AI/DI
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Epec Oy
Tiedekatu 6
FIN-60320 Seinäjoki
Postal address
PL/P.O.Box 194
FIN-60101 Seinäjoki,
Finland
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+358-(0)20-7608 111
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+358-(0)20-7608 110
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8 AI/DI
Possible pin modes:
• +5 V AI voltage mode (pull-down)
• +5 V AI voltage mode (pull-up)
• +20 mA AI current mode
• DI mode
This pin has a dedicated AI GND pin (X1.18) that is internally connected to the
I/O ground and data ground pins.
8.1 AI (Analog Input) mode
• The configurable features are controlled by two control signals:
• One control signal is for selecting:
• Voltage mode: High impedance input for signal from 0 to 5 V with or without
pull-up
• Current mode: Low impedance input for signal from 0 to 22 mA
• One control signal is for selecting (when in voltage mode):
• Pull-up mode to +5 V by a resistor
• Pull-down mode to GND by a resistor
8.2 DI (Digital Input) mode
• This pin can also be used as a digital input by using an application library
• The pin must be configured to voltage mode when used as a digital input
Configure the pin to current mode before applying the current signal.
A switch will disconnect the measurement circuit if an overvoltage event is
detected. Overvoltage protection mode is indicated with a dedicated signal
(DEV_DSC_OVP_STATE_X1_17).
The protection mode is active as long as the overvoltage persists.
The protection circuit can be bypassed (the switch will reconnect the
measurement circuit) momentarily with a reset signal
(DEV_DSC_OVP_RESET_X1_17). The signal is edge activated and the bypass
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