iSMA-B-AAC20 Hardware User Manual
www.ismacontrolli.com
DMP239en | 1st Issue rev. 0 | 02/2022
page 11 of 42
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4.4 Front Panel for iSMA-B-AAC20
Figure 12. Front panel for AAC20
The basic iSMA-B-AAC20 hardware version (iSMA-B-AAC20, iSMA-B-AAC20-M, iSMA-B-
AAC20-D) has a front panel equipped with status diodes and a DIP switch.
The power LED (ON) is on (green) when the controller is running properly.
The communication RS485 LED (COM2) is on (orange) for 20 ms after sending each
message. If the module receives or sends a lot of messages, this LED can be lit
continuously.
The communication Ethernet LED (ETH1) is on (orange) for 20 ms after sending each
message.
U1-U8 LEDs indicate the status of the universal inputs and are lit when resistance
connected to the input is less than 1
kΩ
(dry contact input is active).
Note:
The LED also lights up when voltage connected to the input has a very low
potential.
I1-I4 LEDs indicate the status of the digital inputs and are lit when the input is active.
A1-A6 LEDs indicate the status of the analog outputs and are lit when output voltage
or PWM factor is different from 0.
O1-O4 LEDs indicate the status of the digital outputs and are lit when output is
enabled.
4.5 Front Panel for iSMA-B-AAC20-LCD
Figure 13. Front panel for AAC20-LCD
The iSMA-B-AAC20-LCD hardware version ((iSMA-B-AAC20-LCD, iSMA-B-AAC20-LCD-M,
iSMA-B-AAC20-LCD-D) has a front panel equipped with an LCD display, status diodes, and
function buttons.
The power LED (ON) is on (green) when the controller is running properly.
The communication RS485 LED (COM2) is on (orange) for 20 ms after sending each
message. If the module receives or sends a lot of messages, this LED can be lit
continuously.
