Check the DH+ interface group box

The Channel A (or B) Diagnostics tab shows the current state of the DH+ Interface object and any items affecting its state. Normal states for these items are:
DH+ Interface object - Normal
DH+ entry - Run
If you see
Waiting
as the current state, the front display on the module shows
CNFG FALT
for that channel. If the state is
Waiting
, one or both of the following shows in the
Items Affecting State
dialog box:
If you see:
Do this:
DH+ object
  1. From RSLinx Classic, right-click a 1756-DHRIO module and select
    Module Configuration
    .
  2. Select the Channel Configuration tab.
  3. Make sure you have entered a value for the
    Controller Slot.
  4. Click
    Apply
    , or click
    Restore Defaults
    .
  5. Right-click the 1756-DHRIO module again and select
    Module Statistics
    .
  6. Select the Channel A (or B) Diagnostics tab and verify that the DH+ Interface State shows as "Run".
Routing Table
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Normal