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55
C200HW-PRM21 PROFIBUS Master DTM
Section 2-4
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Timeout
This indicator will be set to ON, when due to the number of rejected PROFIBUS
messages, the Master supervisory timeout has expired. This usually indicates a
short-circuit in the PROFIBUS network. The amount of timeout events is dis-
played in the Bus Monitoring field.
The indicator will be set to ON upon the first occurrence of the timeout. It will not
be reset, until power-down.
Not Ready
The Not Ready notification indicates that the application program has not
started or it has stopped the PROFIBUS DP Master. If this bit is set, the applica-
tion is not ready to receive data.
Auto-Clear
Set to ON indicates that an Auto-Clear event has occurred, i.e. data exchange
with at least one of the slave devices has stopped. The Master Unit has been
switched to CLEAR mode.
Slave Error
When set to ON, it indicates that at least one of the slaves has encountered an
error and is not exchanging I/O data with the Master unit. Refer to the LED indi-
cators in the Station status field to determine which slave devices encountered
the error.
Fatal Error
A Fatal Error has occurred in the PROFIBUS DP Master unit, due to the large
amount of network errors. No further bus communication is possible.
Control Error
The Control Error indicates that an error has been encountered in the down-
loaded parameter set. No communication is possible.
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Error Event
When set to ON, The Error Event
indicates that the device has detected network
short circuits. The number of detected events is displayed in the Short Circuit
Counter. The bit will be set up on the first detected event and will not be reset,
until power-down or reset of the PROFIBUS DP Master unit.
Short Circuit Counter
The Short Circuit Counter displays the number of short circuit error events on
the PROFIBUS network, which were detected by the Master Unit.
Range of Value: 0 to 65535
Transmission Rejected Count
The Transmissions Rejected Count displays the number of rejected messages.
A possible reason for this is, that the Master itself can not receive the token any-
more.
Range of Value: 0 to 65535
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Any Slave Indicator
The LED indicators in the Station status field display the status of each slave
station on the network per address. The colour of the LED indicator indicates the
specific status of the slave device:
• Grey:
The slave device is not configured for this Master Unit.
• Green:
This slave device is exchanging I/O data with the Master Unit.
• Yellow:
New Diagnostic is available from this slave device. Open the Slave
DTM to determine the actual Diagnostics data. Opening this DTM
will clear the LED indicator, and turn to another colour until the
next Diagnostics message is received from the specified slave
device.
• Blue:
The slave device was configured, but not found on the network.
• Red:
The slave station has returned a Set_Prm or Chk_Cfg error and is
not in data exchange with the Master unit.
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Station Address
The Station address field displays the address of the first slave device (i.e. with
the lowest address) which reported an error. The error is specified in the Error
Event field.
Error Event
The Error Event field displays the error which occurred during communication
between the master unit and the slave device as specified in the Station
Address field.
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Connected
When set to ON, this LED indicates that the C200HW-PRM21 DTM is online
and exchanging data with the C200HW-PRM21 PROFIBUS DP Master unit.
LED Indicator /
Information Field
Description