Allen-Bradley 1770-HT1, 1770-HT8, 1770-HT16 Error 21: No Response Received From Device

Smart Transmitter Interface · taken from the manufacturer’s manual, pages cited

Error code21

The Smart Transmitter Interface has not received a response from a field device after exhausting all retry attempts. The manual lists no action for this code.

Model
Allen-Bradley 1770-HT1, 1770-HT8, 1770-HT16
Display shows
No Response Received From Device (21)
Type
Error code
Source
Manual p. 83

What 21 means

No Response Received From Device p. 83

Common causes

  • The Smart Transmitter Interface has not received a response from a field device after exhausting all retry attempts. p. 83

If 21 is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Allen-Bradley service.

Open the manual at page 83 All 1770-HT1, 1770-HT8, 1770-HT16 error codes Manual details & download

This page summarises what the manufacturer’s manual says about 21; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Allen-Bradley. Found a mistake? Report an error.