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 | PD 660, PD 661 and PD 663 LED function
 PD 660, PD 661 and PD 663 slave devices are equipped with 2 LEDs, a green (On) to indicate that power is supplied to the module, and a red (Error) to indicate internal errors within the module. 
 The Error LED is ON if an internal error occurs in the device. 
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