ABB AC800M analog input

I have (8 channel) AI801 analog input module.
before connecting Analog input:-
I musear the voltage between N+ and N- (where N may be any Channel from 1--> and it will be 24Vdc (the channels are source).
therefore I cannot connect my signal to this channel because my signal is 4-20 mA and my signals has its own power supply(4 wire transmiters).
Note:- I have in compact control builder AC800M software in hardware config. in setting tab a parameter called Activate channel1....Activate channel2......Activate channel3.............................Activate channel8 and the value of this parameters are true.
dose this mean if I chose false to this parameter I will make the channel as a sink??????
Thank you

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