turck BL20 Series - 7 Digital Input Modules; 7.1 LED status indicators; 7.2 Module overview

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2020/09
7 Digital Input Modules
Digital input modules (DI) detect electrical high- and low-level values through the base module con-
nections and transmit the corresponding digital value to the gateway via the module bus.
The module bus electronics of the digital input modules are galvanically isolated from the field level
via an optocoupler. The module provides reverse polarity protection.
7.1 LED status indicators
Channel statuses are indicated by LEDs. Error signals from the I/O level are indicated by each mod-
ule via the ”DIA” LED.
A continuously lit up red ”DIA” LED indicates the failure of the module bus communication at the
digital input module.
7.2 Module overview
Number of channels positive switching negative switching
BL20-2DI-24VDC-P 2 
BL20-2DI-24VDC-N 2 
BL20-2DI-120/230VAC 2
BL20-4DI-24VDC-P 4 
BL20-4DI-24VDC-N 4 
BL20-4DI-24VDC-P 8 
BL20-16DI-24VDC-P 16 
BL20-E-16DI-24VDC-P 16 
BL20-E-16DI-24VDC-N 16 
BL20-32DI-24VDC-P 32 