LS ELECTRIC XGL-PSEA, User Manual

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Chapter 4 Communication Programming
4-19
"I/O parameter error "
"Special module parameter error "
"Special module parameter error "
"Program error "
"Program code error "
"System watchdog error "
"Base power error "
"Scan watchdog error "
"Base information error "
"Timer index error "
"Compile error "
"Instruction error "
"PLC_MODE_STOP "
"PLC_MODE_DEBUG "
4) Operation of Sync, Freeze
XGL-PSEA supports Sync and Freeze instruction as Global instruction according to Profibus-DP standard.
You can use Sync and Freeze function by using the master supporting Sync and Freeze instruction.
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Sync instruction: This is used to synchronize the output data of the slave station. If slave station receives Sync
instruction from the master, it keeps lastly received output data as current output data. Slave repeats this action
whenever it gets Sync instruction of the master and output data is synchronized according to Sync instruction.
Master cancels Sync action of slave by sending Unsync instruction.
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Freeze instruction: This is used for the master to read momentary value of input data. If slave station receives
Freeze instruction, it keeps then input value as input data. Though actual input data changes, it keeps the value
of moment when it receives Freeze instruction as input data. And slave repeats this action whenever it gets
Freeze instruction of the master. Master cancels Freeze state by sending UnFreeze instruction.
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