Toshiba ASD-G9ETH 사용자 설명서

 

  

83

ICC 

 

 

 
 

Often times, applications may need to both read data from and write data to the 
drive.  At a minimum, this will require two MSG instructions and two message 
controller tags.  Figure 86 shows an example of two MSG instructions, one for 
reading and one for writing.  The only item of note that differentiates this 
example from the multiple-read example in section 13.2.8 is the addition of the 
en_wr XIC element.  The reason for the addition of this element is that while 
reading from a remote device is often continuously performed (monitoring), 
data is typically written to the remote device only when necessary (i.e. when the 
value to write has changed).  This conserves both network bandwidth and 
potentially EEPROM lifespans on the target device.  The en_wr element in this 
example, therefore, would typically be replaced in an actual application program 
by user-provided logic which controls the conditions under which a write 
operation would be performed. 
 
Figure 87 shows the configuration details of the example wr_connection MSG 
instruction.  Note that the chosen “Message Type” is “CIP Data Table Write”, 
and that this instruction will only be writing to one drive register: namely, the 
frequency command (Destination Element is wr_reg_1008).  The Source 
Element in this case is the 8

th

 element (starting from index 0) of an INT array 

tag named “wr_data_array”.