Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 139)

Faceplate Communication Error
and no keyboard respose in
MOD 30ML
Diagnostic Error codes DIF 4
and 5 are reported. Instrument
locks up with a shutdown fault.
Problem Description:
This problem starts with diagnostic errors DIF 4 and 5. The keyboard might get locked up. The instrument
eventually goes into a shutdown.
Applies to:
MOD 30ML configured from front face or Application Builder software or Visual Application Designer
ViZapp Software.
Explanation:
This problem may be due to noise or static discharges on the analog inputs. The built-in analog inputs
use the same communication channel on the processor as the display, which explains the faceplate
communication errors.
Solution:
Check whether the analog inputs are currently floating. To reduce electrical noise and eliminate static
build-up, we recommend grounding these inputs.
The configuration default for a faceplate communication error is to force a shutdown. This default can be
changed, so that the controller will continue to operate, as long as there are no other critical errors. The
faceplate communication error would still be reported, allowing you to determine whether the added
grounding corrected the problem. This is done in the DIF (Display Interface block) block’s configuration
as shown in the next figure:
Topic: MOD 30ML/Modcell Technote: TNML0801-2
MicroMod Automation, Inc. Rev. August-2001
Faceplate Error.doc Page 1 of 2