B&B Electronics MODSCAN32 - Manual - Manual (Page 85)

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If EnableBlockWrites is TRUE
Setting a data value will change the contents of the
control's data. Status will be set to UNINITIALIZED
indicating that the data within the control does not
match the data in the slave. No messages are issued
to the modbus.
If an Update request is made, new data received from
the slave device will overwrite any data which may
have been written by the program. The application
must insure that Updates are suspended during block
write operations.
If BlockWrite() returns TRUE
Guaranteed to get WriteFinished Event.
Status will reflect success of failure.
An Update() request is automatically issued
by the control after receiving a response from
the slave.
If BlockWrite() returns FALSE
WriteFinished is NOT fired.
BlockWrite may return FALSE under the following conditions:
DEMO_TIME_EXPIRED
OUT_OF_BUFFERS
OCX_HELPER_FAILURE (MbOCXsvr Not Running)