Monarco-HAT-Hardware-Reference-Manual
Monarco HAT Hardware Reference Manual 20190728-1
11
LED Indicators 3.2.2.
There are 9 LED indicators on board bottom side under the P2 terminal connector. These are divided
into three groups with predefined functions:
LED0 (orange) – Monarco HAT firmware status:
o Fast blink (5 Hz, 1:1): firmware running, outputs in safe state (no valid process data
received during configured timeout interval).
o Slow blink (0.5 Hz, 1:1): firmware running, outputs under control by process data.
o Continuous on: after Host Watchdog was triggered.
LED1 to LED4 (green) – Digital outputs DOUT1 to DOUT4 state indication.
LED5 to LED8 (green) – Digital inputs DIN1 to DIN4 state indication.
All LEDs are controlled by dedicated microcontroller pins, so they can be controlled by user provided
process data instead of the predefined function. Please see SPI protocol specification for details.