Lenze smd Series Drives - Manual (Page 11)

7 RG-SDMOD
Data & Register Format
3 Data Representation - Internal and External
3.1 Register Format
All registers are 16 bits. The data within these registers can take on the following forms:
• Individual bit commands (16 per register).
Example: Register #1 (Modbus Register #2).
• Individual bit flags (16 per register).
Example: Register #22.
• A chain of two 8 bit unsigned integers.
• A 16 bit unsigned integer.
This unsigned integer could in turn represent many different types of data with various scaling
rules and units, which are defined by the DATA TYPE of the register.
3.2 Data Types
Data passed in registers across the Modbus communications link are always in INTERNAL units. The drive
itself may show the information in alternate DISPLAYED units. For Example: drive speeds are always stored
internally as tenths of a Hz but the drive may display that speed in whole Hz by dropping the tenth using
programmed conversion factors. Table 3 lists examples of the internal units used on the
smd series.
Table 3: smd Series Internal Units
Type Unit Example
SPEED .1Hz 100Hz = 1000
TIME .1Sec 30.0 Sec = 300
3.3 smd Drive Registers
Registers #0 through #50: (Modbus Registers #1 to #51) Reserved for configuration and control
Registers #51 through #255 (Modbus Registers #52 to #256) Reserved for the drives’ programming
mode parameters. Programming Mode Parameters are the parameters
that can be accessed from the local keypad on the drive.
The entries in Table 6 are based on smd Drive Software # 1.51 (Parameter Configuration = 400) and Drive
SW 2.00 and 2.01 (Parameter Configuration 507). If a later revision of software were to change register
definitions, drive operation could be seriously affected. This will be identified for a given drive by examining
Register #50 (Parameter Configuration Number). The number displayed at power up on drive display can
also identify it. If it is not 400 or 507, writing to any register on the drive MUST NOT BE ATTEMPTED unless
your Controller has been setup to support the new configuration.