Why isn't the Ready LED on when power is applied to the 170ANR12090 module ?



In addition to having power connected to this module, you also need to have a non-zero value in the System Information register. This register is the first output word register which is IO mapped or Traffic copped. Valid settings for this register are 0001 - FFFF hex. If a non-zero value is added to this register and the ready LED is still not on, then there is a hardware problem with the module.