Toshiba Pbdp-110 사용자 설명서

 

  

31

In order to read from a parameter or write to a parameter, two control bits are 
provided for each drive’s data structure.  These bits, labeled Req1 and Req0 in 
the Action Bits word, can have the following values: 
 
 

Req1 

Req0 

Meaning 

 

0 

0 .............. No action (idle state) 

 0 

1 .............. Parameter 

read 

 

1 

0 .............. Parameter write (RAM & EEPROM) 

 

1 

1 .............. Parameter write (RAM only) 

 
Similarly, when a drive responds to a parameter read or write request, 2 status 
bits per data structure are provided.  These bits, labeled Resp1 and Resp0 in 
the Action Bits Response word, can have the following values: 
 
 

Resp1 

Resp0 

Meaning 

 

0 

0 .............. No action (idle state acknowledge) 

 

0 

1 .............. Parameter read success acknowledge 

 

1 

0 .............. Parameter write success acknowledge 

 1 

1 .............. Error 

indication 

 
Note that the PBDP-110 will respond with Resp1:Resp0 = 1:0 upon a 
successful parameter write, regardless of whether the write was to RAM & 
EEPROM or to RAM only. 
 
Performing a parameter read or write action from the Profibus master involves 
the following process: 
 
1.  Send a “no action” code (Req1=0 and Req0=0).  Every parameter access 

must begin from the idle state.  Once this state is sent, the Profibus 
master must then wait for the PBDP-110 to respond with an idle state 
acknowledge (Resp1=0 and Resp0=0). 

2.  If the action is to be a data write, set the parameter data in the parameter 

data write word.  If the action is to be a data read, the parameter data write 
word value is irrelevant. 

3.  Set the parameter register number and action code (Req1 and Req0).  For 

an explanation of parameter register numbers, refer to section 11. 

4.  Once the PBDP-110 receives the read or write request, it will begin 

processing it.  The time required to complete the request depends 
primarily on the connected drive’s baud rate setting and internal 
processing state, but can vary from several milliseconds to several tens of 
milliseconds. 

5.  Once the PBDP-110 has completed the request, it will place its response 

in the action bits response, parameter number response, and data / error 
code response locations: