ProSoft Technology 5205-DFNT-PDPS User Manual

Page 45

Diagnostics and Troubleshooting

PDPS ♦ ProLinx Gateway

PROFIBUS DP Slave

ProSoft Technology, Inc.

Page 45 of 61

December 31, 2008

Bit 0

Offline/Passive-idle

0 = SPC3 exits offline and goes to passive-idle. The idle timer and Wd timer

go offline.

1= SPC3 exits offline and goes to passive-idle. The idle timer and Wd timer

are started.

Bit 4, 5

10 = Data Exchange State is Normal. The SPC3 has a correct configuration.

Bits 6, 7

Watchdog

Timer

Automatic Baud Rate Identification

The SPC3 is able to identify the baud rate automatically. The "baud search" state
is located after each RESET and also after the watchdog (WD) timer has run out
in the "Baud_Control_state." As a rule, SPC3 begins the search for the set rate
with the highest baud rate. If no SD1 telegram, SD2 telegram, or SD3 telegram
was received completely and without errors during the monitoring time, the
search continues with the next lowest baud rate.

After identifying the correct baud rate, SPC3 switches to the "Baud_Control"
state and monitors the baud rate. The monitoring time can be parameterized
(WD_Baud_Control_Val). The watchdog works with a clock of 100 Hz (10
milliseconds). The watchdog resets each telegram received with no errors to its
own station address. If the timer runs out, SPC3 again switches to the baud
search state.

Further explanation of Status Register [0]: Word 9 Bit states