Yaskawa BACnet MS/TP - Manual (Page 41)

u Enter Command
Enter Commands are only required when using AV29 and AV30 to write drive parameters.
An Enter command is not required when reading or writing to the other BACnet objects.
When writing parameters to the drive from a controller using BACnet communications, an
Enter command must be issued to enable these parameters. This section describes the types
and functions of the Enter commands.
n Enter Command Types
The drive supports two types of Enter commands as shown in Table 18 .
Table 18 Enter Command Types
BACnet Object Modbus Address Description
BV55 (Write “ON”) 0910H (bit 0)
Writes data in the active RAM only. Parameter changes are lost
when the drive is shut off.
BV56 (Write “ON”) 0900H (bit 0)
Simultaneously writes data into the EEPROM (non-volatile
memory) of the drive and enables the data in active RAM.
Parameter changes remain after cycling power.
Note: The EEPROM can only be written to 100,000 times, so it is recommended to limit the number of times
writing to the EEPROM. The Enter command registers 0900H and 0910H are write-only and if these
registers are read, the register address will be invalid. However, BACnet objects BV55 and BV56 can
be read without error.
11 Accessing Drive Parameters and the Enter Command
YASKAWA TOEP YEACOM 08A A1000 Option BACnet MS/TP SI-B3 Installation & Technical Manual 41