Rockwell Automation 1771-DB Basic Module User Manual - Series A - Manual (Page 21)

Installing the BASIC Module
Chapter 3
3–7
If the FLT LED lights after the module has been operating properly check
the following troubleshooting chart.
Problem Probable Cause Recommended Action
Module’s programming port
does not respond Hardware failure Send module for repair
Module’s programming port
continues to function but FLT
LED goes on and off Problem with block-transfers
between processor and BASIC
module Verify ladder logic
Module’s programming port
continues to function and FLT
LED goes out when processor
is switched to program mode
Module’s programming port
continues to function and FLT
LED remains on Problem with block-transfer
circuitry on the BASIC Module Send module for repair
The BASIC Module has a 32 K byte EPROM installed (figure 3.4). We
recommend that you keep JEDEC standard 8 K, 16 K or 32 K byte
EPROMs which use 12.5V DC programming voltage as spares. You can
buy 32 K byte EPROMs from Allen-Bradley (part numbers 940654-02 or
9406454-03).
3.3
Module Status LED’s
(continued)
3.4
Installing the User Prom