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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
11-10 A5E00105492-03
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The shorter the selected watchdog interrupt period, the more likely it is that
watchdog interrupt errors will occur. You must take into account the operating
system times of the CPU in question, the user program runtime and extension of
the cycle time by active PG functions, for example.
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Details on the OBs and on SFCs required for their evaluation can be found in the
67(32QOLQH+HOS and in the Manual 6\VWHP6RIWZDUHIRU66\VWHP
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Table 11-5 The BUSF, BUSF1 and BUSF2 LEDs
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On On On/
flashe
s
- - PROFIBUS DP interface error.
Remedy: Refer to the table below
On On - On/
flashes
X Error at the first PROFIBUS DP interface of CPU 317-2
DP.
Remedy: Refer to the table below
On On - X On/flash
es
Error at the second PROFIBUS DP interface of CPU 317-2
DP.
Remedy: Refer to the table below
Description of status X:
The LED can assume the status On or Off, but this status has no effect on the
current CPU function. For example, the states Force On or Off do not influence the
STOP status of the CPU
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