Applies To:
  • CitectSCADA 3.00
Summary:
The following protocols support the blocked write feature new to version 3.0. Some protocols support blocked writes for all data types and some protocols support this feature for analog data types only. This is a limitation of the physical protocol or PLC. 

Solution:
For all data types:
CCM, DISKDRV, GEDDE70, MELSEC, MBPLUS, MODBUS, SIEMENS, TIDIRECT, TISERIAL, TIWAY, TOSHIBA.

For analog data types only:
ABKT, ABEI, COMLI, FUJI, FUJIT, GENIUSIO, RNET, RELIANCE, SQUARED, TICIM.

For some data types only:
OMRON For DM, PV, IO relay, TC, LR and HR only.

In general the maximum number of items that can be written in one request is the same as the maximum block size for the protocol, except when writing to digitals for the following protocols:

TIWAY / TIDIRECT / TISERIAL. MaxWrite = MaxBlockSize / 8.
TOSHIBA. MaxWrite = MaxBlockSize / 16.
MELSEC. MaxWrite = 160

 
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