Lenze MCH Series Drives Modbus Communications - Manual (Page 23)

19 RG-MHMOD
Drive Control & Communication
5.11 Unlock Commands - Register #48
Register #48 (Unlock Commands) unlocks commands by using 0000 for the password. If the correct
Programming mode password is entered then the appropriate programming parameters can also be
accessed (refer to the full parameter protocol specification if access to programming parameters is
required). Enabling commands also activates the drive Watchdog timer if programming parameter #15
(Serial) is set to W/TIMER (it uses a fixed 10 seconds timeout). If the drive sees no activity within the
update time period and Parameter 30 is either set to SERIAL AUTO or S AUTO/NO HND, it will stop the drive.
Whenever a communications session (where #48 or #49 was activated) is to be ended, register #1 bit 1
(Lock Security) must be asserted. This disables the watchdog and prevents further accesses to registers.
Note: Terminal TB1 must be closed in order to unlock serial control.
5.12 Unlock Parameters - Register #49
Register #49 (Unlock Parameters) unlocks programming parameters for writing when the proper
Programming Password is entered. Whenever a parameter writing session (where #49 was activated) is
to be ended, register #1 bit 1 (Lock Security) must be asserted. This disables the watchdog and prevents
further write access to Parameter Registers.
5.13 Register Version
Register Version is the number to identify if current version of software has any register changes relative
to previous versions: a register has been added or deleted, a register’s min/max limits have changed, a
register’s function has been changed, or a register’s default value has been changed. Generally it is the
programming parameters that are changed. Typically the Control Registers (AC TECH Register #1 through
#50) are quite stable.