Operating Instructions

Chapter 5—Troubleshooting
5-14 Siemens Building Technologies, Inc.
Digital and Analog Inputs Troubleshooting
The following information describes troubleshooting procedures you can use should you
encounter a problem with the controller's digital and/or analog inputs. Find the symptom that best
describes the problem and perform the corrective action that follows. If the problem persists,
contact your local Siemens Building Technologies representative.
A. Analog input points displayed at field panel do not read as expected
(pre-APOGEE firmware or manually unbundled points).
1. Check slope/intercept entries for the points in question and change as needed. See
the point database tables in Chapter 2 or Chapter 3—Applications.
2. Check sensor and contact your local Siemens Building Technologies representative
if replacement is necessary.
B. Points cannot be read or overridden from field panel.
Check points that are not functioning for proper addressing and correct as needed.
C. One or more inputs (digital or analog) do not appear to be
functioning properly.
1. See Dl 3 and DI 4 Check on page 5-22, and/or AI 3 and AI 4 Check on page 5-23.
Inspect all wires and make sure they are making good contact with connector.
Rewire any connections that are questionable.
2. Install wires into correct terminals. See the wiring diagram for your application in
Chapter 2 or Chapter 3—Applications.
3. Contact your local Siemens Building Technologies representative.
D. AI 3 (Point 15) or SUPPLY TEMP (Point 15) appears as failed, (*F*).
1. Check cable from controller to supply-duct or auxiliary temperature sensor for proper
connection to AI 3 (terminals 4 and 5).
2. Check temperature sensor and replace if necessary. Contact your local Siemens
Building Technologies representative for sensor replacement.