Maintenance And Diagnostics - Siemens DF8000 Installation Function & Configuration Commissioning Safety Regulations

9

Maintenance and diagnostics

32
Building Technologies
Fire Safety & Security Products
The following hints should help you to identify possible malfunctioning and/or incor-
rect operation of DF8003. They cannot be considered as exhaustive of all operat-
ing conditions you may encounter.
A DF8003 does not communicate with the management station
Use RX/TX LEDs on the NK822x and on the DF8003 panels to identify the cause
of the trouble. Note that NK822x polls the DF8000 units continuously (one after the
other) and each unit responds when selected.
1. Baud rate is set to different values on CPU module and NK822x. The TX LED
on the NK822x and the RX LED on the DF8003 flash but there is no response.
Action: verify the NK822x configuration in Composer and as well as the
DF8003 CPU dip-switch settings.
2. RS232/RS485 converter is faulty, either TX or RX direction may not work. The
TX LED on the NK822x flashes but the correspondent RX LED on the DF8003
does not. On the opposite direction, the problem shows up the other way
around: the TX LED on the DF8003 works whereas the RX one on the NK822x
does not.
Action: replace the conversion unit.
3. DF8003 module line driver is faulty. When selected, the DF8003 tries to re-
spond (TX LED may or may not flash depending on the type of trouble) but fails
to transmit and the RX LED on NK822x does not.
Action: replace the DF8003 unit. Note that DF8003 can also substitute for older
CF9003.
4. NK822x port is not properly configured or is faulty. The TX LED on the NK822x
does not flash at all.
Action: verify the NK822x configuration in Composer. If necessary, replace the
unit.
5. Line is faulty.
Action: verify line integrity.
Irregular communication
1. Addressing collision. Two or more units do not communicate.
Action: verify DF8003 CPU dip switch settings and the corresponding configu-
ration in Composer.
2. Missing termination resistors: a very long RS485 line (typically above 800 m.)
may need 100 Ohm termination resistors.
Action: install resistors at the very ends of the line.
RS485 Line fault
1. Line is interrupted.
Action: verify the line integrity.
2. One of the DF8003s has the line driver electrically shorted.
048_DMS_DF8000_ICC_MP4.15_A6V10081388_c_en.doc
06.2008