bsprowls
Member
I have a A-B 1794-OF4I module. In the ladder logic, what range of values is there that will command it to go from 4 to 20 ma of output? I believe the manual says 2's compliment, 0000 to 7878, I am really not familiar with this.
Analog output card range
- Thread starter bsprowls
- Start date
TConnolly
Lifetime Supporting Member
What is it you are not familiar with? Twos compliment binary numbers? or is it that the number 7878 seems odd? Or module configuraiton in general?
The value 7878 as given in the manual is a Hexadecimal value. This equates to 30840 decimal, and 0111100001111000 in Twos compliment binary. Two's compliment is how signed binary numbers are formatted in the PLC.
http://en.wikipedia.org/wiki/2s_compliment
I believe that the module ouputs 21.5 mA at 32767 so you use 30840 (7878h) to output 20mA.
The value 7878 as given in the manual is a Hexadecimal value. This equates to 30840 decimal, and 0111100001111000 in Twos compliment binary. Two's compliment is how signed binary numbers are formatted in the PLC.
http://en.wikipedia.org/wiki/2s_compliment
I believe that the module ouputs 21.5 mA at 32767 so you use 30840 (7878h) to output 20mA.
Last edited:
Similar Topics
I have a Mitsubishi FX2N-64MR-UA1 processor. The 1st analog output card is an FX2N-4DA. It requires 24VDC power.
That card is obsolete. The card...
Hello,
As you may remember, I posted in January about an issue we were having with our micro850 controllers (2080-LC50-48AWB) to operate...
Hello,
We are using 80 micro850 controllers (2080-LC50-48AWB) to operate irrigation booms in our nursery. We are using an analog output card...
Greetings,
I have been charged with a project to link data from a Beckhoff PLC using Allen Bradley Point IO to a PLC 5. The PLC5 does not have...
Hi All:
I was hoping someone could help point me in the right direction as to how to setup a Flex IO AO Card in RSLogix500.
As it stands I have...