Hardware specific:
1 Insulation:
       >10mOhm at 500v DC
2 dielectric:
      1500V 1 minutes
3 auxiliary relay:
     24v DC maxmum 300ma
4 installation:
   power to PLC as close as possible
  the instllation of the PLC to the control box at least 50 mm distance
5 Ground wire:
    the ground wire must applied the national code, and at least 12AWG.
6 Fiter for the Power:
    put the proper filter to avoid surge to hurt PLC
Sinking and sourcing circuit:
 Soucing circuit:
      the DC positive connect to Common
Sinking circuit:
      the DC negative connect to Common
Input reponse:
     1 to 9 ms
input current:
      4 to 8 ma