Rockwell Automation 1791-XXXX Discrete I/O AC and DC Block I/O Input and Output Modules - Manual (Page 11)

Chapter
2
2-1
I/O Interface and System Design
In this chapter, you will learn what is compatible with block I/O, how to
determine what devices to use, and what fuse to use for outputs.
Block I/O inputs convert ac or dc signals from user devices to the
appropriate logic level for use within the processor. Typical input devices
include:
proximity switches
limit switches
selector switches
float switches
pushbutton switches
AC block output modules are compatible with 1771 series input modules
that require greater than 3mA for the off-state current. A 1771 I/O input
module that meets these specifications is:
cat. no. 1771-ID16 ac isolated input module
AC block input modules are compatible with 1771 series output modules if
the off-state leakage current of the module is less than the block module
minimum off-state current and the on-state voltage minimum of the ac
block input is greater than the supply voltage minus the on-state voltage
drop across the 1771 output module. Some 1771 I/O modules that meet
these specifications are:
cat. no. 1771-OAN ac (120V) output module
cat. no. 1771-OD16 ac (120V) isolated output module at 120V ac
cat. no. 1771-ODD ac (120V) isolated output module at 120V ac
cat. no. 1771-ODZ isolated ac output module
DC block output modules are compatible with 1771 series input modules
that require greater than 0.5mA for the off-state current. Some 1771 I/O
input modules that meet these specifications are:
cat. no. 1771-IB dc (12–24V) input module
cat. no. 1771-IBD dc (10–30V) input module
cat. no. 1771-IBN dc (10–30V) input module
cat. no. 1771-ICD dc (20–60V) input module
cat. no. 1771-IN ac (24V) input module
cat. no. 1771-IQ16 dc (24V) input module
cat. no. 1771-IH dc (24-48V) input module
Chapter Objectives
Input Compatibility