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Section 4 Linking Device Diagnostics
Power-on Self Tests
3BDD011677-600 A
75
Section 4 Linking Device Diagnostics
Power-on Self Tests
Test Cases
During start-up of the device, several hardware components of the system are tested.
For runtime reasons, the test is divided in several parts. In the first part, which is
carried through with each start, the following components are checked:
•
Access to RAM
•
Checksum test of flash content (firmware)
•
H1 channel: transmission and reception by internal loopback
•
Interrupt triggering of the H1 controllers
In addition, all LEDs are briefly switched on during booting for an optical
performance test.
The RAM test checks whether the entire RAM memory space can be accessed and
whether the data are consistent. During the checksum test, the consistency of the
flash memory content is checked. If an error is found during this process, booting
cannot be continued. In that case the linking device tries to fetch a firmware update
from the maintenance server. If the maintenance server is operational and its IP
address is stored in the linking device, the linking device downloads the flash
memory content from the maintenance server by means of the Bootp/TFTP
protocol. After a flash memory update, all FF configuration data will be lost, but the
IP configuration is still valid.
Supplementary RAM tests can be performed as well by clicking the button Enable
Extended RAM Test and Reboot on the web page RAM Test Configuration in
the Configuration menu (refer
on page 71). The extended
RAM tests cover the following aspects:
•
RAM address bus
•
RAM integrity test
Summary of Contents for LD 800HSE
Page 2: ......
Page 3: ...Device Management FOUNDATION Fieldbus Linking Device LD 800HSE and LD 800HSE EX V3 6 0 0 ...
Page 102: ...Device Redundancy Appendix B Limits and Performance Data 102 3BDD011677 600 A ...
Page 124: ...Redundancy Behavior Appendix C Technical Reference 124 3BDD011677 600 A ...
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