I can not write in FP-AO-200 from field point exlorer

[lord]

I have a FP-1600, FP-AO-200 and FP-AI-100 module ,4-20ma. When I use field explorer I can not command any of the channel output current, red leds of this module light.But, I can read the channel input.
In fact, my project consist to regulat the water level in two tanks.
It's why before to do that, I must configure and verify my field point module.
Please can you help me for resolve this problem,so I will continue my project.
Yours faithfuly

[Aaron_G]

Do you mean that when you try to write an output value, the channel status LED lights up? If so, the actual write command (e.g. output 10 mA) was successfull, but the module is reporting that there is a channel status error on the channel. Some of the common causes for the FP-AO-200 channel status LED to light follow; 1) No external power supply. The FP-AO-200 requires an external power supply of 5-30 VDC to be wired to it's V & C terminals.
2) An incorrectly sized external power supply. The voltage rating of the external power supply directly affects the maximum load resistance on the channel. The module has an internal 3 Volt drop. Thus for a channel to provide 21 mA output, the maximum drive resistance = (Vpowersupply - 3 Volts)/21 mA. Thus for a 1000 ohm lo
ad, the power supply must be 24 Volts. A 12 Volt supply can drive up to 425 ohms per channel. 3) Too much load resistance. The FP-AO-200 can drive a maximum of 1000 Ohms per channel (see #2 above for formula). 4) Incorrect wiring. If the system is not wired correctly, there will be an Open Current Loop which results in the channel status LED lighting.

Regards,
Aaron