B&B Electronics RS-485 Digital I/O Module 485SDD16 - Manual (Page 24)

485SDD16-1005 Manual Appendix C C-5
B&B Electronics -- 707 Dayton Road -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5104
Figure C.2 - DBM16 Outline Drawing
Inputs
Digital inputs are used to sense "HIGH" and "LOW" states based
on voltage levels. This is accomplished via switch closures, contact
closures or a solid state digital signals. Each DBM16 input is pulled
up through a resistor and will be read as a logic "1" (HIGH) by the
SDD16 module. When an input on the DBM16 is grounded (below
+1.5Vdc), a logic "0" (LOW) will be read by the SDD16 module.
Figures C.3 - C.6 show examples of some typical input interfaces.
Figure C.3 - Switch Input
C-6 Appendix C 485SDD16-1005 Manual
B&B Electronics -- 707 Dayton Road -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5104
Figure C.4 - Solid State Input
Figure C.5 - Isolated Mechanical Input
Figure C.6 - Isolated Solid State Input