10 TROUBLESHOOTING
10.3 Troubleshooting by Symptom
115
10
10.3
Troubleshooting by Symptom
Communications with DP-Slaves fail
The following lists the actions to be taken if communications with DP-Slaves cannot be performed.
communications are unstable
The following lists the actions to be taken if communications are unstable.
Check item
Action
Are the PROFIBUS cables wired correctly?
Check the wiring status of the PROFIBUS cables.
For details on wiring of the PROFIBUS cables, refer to the following.
Is the terminal station of network connected to a bus terminator?
Is the bus terminator a specified one?
Check the bus terminator and connect it.
For details on bus terminators, refer to the following.
Page 47 Wiring specifications of terminating resistor
Is the PROFIBUS-DP network configuration correct?
Check the PROFIBUS-DP network configuration.
For details on the PROFIBUS-DP network configuration, refer to the following.
Page 40 Configuration of PROFIBUS-DP network
Are all DP-Master and DP-Slaves connected to the PROFIBUS-DP
network powered on?
Power on all DP-Master and DP-Slaves.
Has an error occurred to the CPU module?
Check the error of the CPU module.
Are the parameter setting details with the configuration of the DP-
Slaves?
Modify and rewrite the parameters.
Is 'Data exchange start request signal' (Un\G2.b0) of the DP-Master
turned on?
Turn on 'Data exchange start request signal' (Un\G2.b0).
Has an error occurred to a DP-Slave?
(Has 'Diagnostic information detection signal' (Un\G0.b1) or the BF
LED turned on?)
Check diagnostic information on the DP-Slave where the error is occurring and take
action.
For DP-Slaves where an error is occurring, check 'Slave status area (Diagnostic
information detection)' (Un\G23056 to Un\G23060) whether bit relevant to the targets
are on or not.
Is any error information stored in 'Diagnostic information area'
(Un\G23072 to Un\G23199) of the buffer memory?
Take action according to the error information.
Is any error information stored in 'Extended diagnostic information
area' (Un\G23328 to Un\G23454) of the buffer memory?
Take action according to the error information.
Check item
Action
Are more than three repeaters communicating between the FX5-DP-
M and a DP-Slave?
If more than three repeaters are communicating between the FX5-DP-M and a DP-
Slave, reduce the number of repeaters to three or less.
Is each segment length within the specified limit?
With any segment exceeding the specified limit, change it to a length within the limit.
Are there two bus terminators installed at both ends?
Install two bus terminators at both ends if the bus terminators are not installed there.
Is the number of connected modules in each segment within the
specified limit?
If the number of connected modules in a segment is exceeding the specified limit,
reduce it to the limit or less.
Is the number of segments to which devices are connected three or
less?
If the number of segments to which devices are connected is exceeding three, reduce
the number to three or less.
Do the LED turn on and off normally?
Take action depending on the LED turn on and off states. (
LED)
Is any error information stored in 'Diagnostic information area'
(Un\G23072 to Un\G23199) of the buffer memory?
Take action according to the error information.
Is any error information stored in 'Extended diagnostic information
area' (Un\G23328 to Un\G23454) of the buffer memory?
Take action according to the error information.
Содержание FX5-DP-M
Страница 1: ...MELSEC iQ F FX5 User s Manual PROFIBUS ...
Страница 2: ......
Страница 9: ...7 MEMO ...
Страница 12: ...10 INDEX 168 REVISIONS 170 WARRANTY 171 TRADEMARKS 172 ...
Страница 13: ...11 CONTENTS ...
Страница 19: ...1 DESCRIPTION 17 1 MEMO ...
Страница 100: ...98 9 PROGRAMMING 9 2 DP Master settings DP Slave FDL address 2 ...
Страница 101: ...9 PROGRAMMING 9 2 DP Master settings 99 9 DP Slave FDL address 3 ...
Страница 108: ...106 9 PROGRAMMING 9 8 Program Example of the Global Control Function ...
Страница 109: ...9 PROGRAMMING 9 8 Program Example of the Global Control Function 107 9 ...
Страница 110: ...108 9 PROGRAMMING 9 8 Program Example of the Global Control Function ...
Страница 112: ...110 9 PROGRAMMING 9 9 Program Example of Acyclic Communication Acyclic Communication ...
Страница 114: ...112 9 PROGRAMMING 9 10 Program Example of the Alarm Acquisition Function ...
Страница 169: ...APPX Appendix 4 Processing Time 167 A MEMO ...
Страница 175: ......