Omron CJ Series Operation Manual page 122

3 Configuration Software
DPVI Tab
PROFIBUS DP-V1 defines extended communication functions between a PROFIBUS DP-V1 mas-
ter and a PROFIBUS DP-V1 slave device. These extensions include:
• Acyclic communications between master and slave to allow re-parameterization during I/O
data exchange.
• Extended alarm reporting and acknowledgement.
Settings related to these extensions are sent to the slave device through the Set_Prm message.
Note 1 The PROFIBUS DP-V1 settings in this tab refer to PROFIBUS DP-V1 Class 1 communica-
tion only. For PROFIBUS DP-V1 Class 2 communication no specific settings are required.
2 The CJ1W-PRM21 PROFIBUS DP Master units will automatically disable the DP-V1 set-
tings to avoid the slave devices to use PROFIBUS DP-V1 functions. Only the CJ1W-
PRM21 PROFIBUS DP-V1 Master Units will use the settings below.
The DPV1 settings window is shown below.
 Enable DPV1
This checkbox enables or disables the DPV1 functions for the specific slave device. The Master
DTM will clear this setting prior to download.
 Max. Channel Data Length
This parameter defines the maximum size in bytes of the acyclic message exchanged with the PRO-
FIBUS DP-V1 Master Unit. The size ranges from 4 bytes to 244 bytes. The actual upper limit of the
number is defined by the buffer capacity of the slave device.
3-44 CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)