Manual ME-582x Series
Revision 0.9
3 Hardware
page 12
Meilhaus Electronic
3.4
Digital Input/Output
The ME-582x opto-isolated ports have been designed for applications in
industrial control applications (typ. 24 V). An external power supply (pin:
VCC_EXT) is required for the opto-isolated digital-I/O section. Depending
on the application, the drivers of the output ports can be configured as sink
or source or high impedance via software. The isolation voltage to PC-
ground is 1000 VAC
RMS
.
The ME-5820 has 16 opto-isolated inputs (port A) and 16 opto-isolated
outputs (port B). The ME-5821 has 32 opto-isolated inputs (port A and port
C) and 32 opto-isolated outputs (port B and port D). Due to the opto-isola-
tion, the port direction is fixed.
The programming of the various operating modes is described in chapter
4.1 from page 22.
3.4.1
Opto-Isolated Inputs
The ME-5820 has 16 opto-isolated inputs (port A).ME-5821 has 32 opto-
isolated inputs (port A and port C).
The inputs have been designed for an input high-level U
in,H
=
3…60 V. A
reference to the ground of the external circuitry via GND_EXT (pins 9, 11,
59) has to be setup in any case. The input lines show logic “0” if not con-
nected.
Picture 4: Inputs of the ME-5820
