Design Guide | VLT® AutomationDrive FC 360
PKE = 1155 hex - Read parameter value in parameter 3-41 Ramp 1 Ramp Up Time:
l IND = 0000 hex.
l PWE
HIGH
= 0000 hex.
l PWE
LOW
= 0000 hex.
Figure 59: Telegram
If the value in parameter 3-41 Ramp 1 Ramp Up Time is 10 s, the response from the follower to the master is shown in .
Figure 60: Response
3E8 hex corresponds to 1000 decimal. The conversion index for parameter 3-41 Ramp 1 Ramp Up Time is -2, that is, 0.01.
Parameter 3-41 Ramp 1 Ramp Up Time is of the type Unsigned 32.
9.6 Modbus RTU
9.6.1 Prerequisite Knowledge
Danfoss assumes that the installed controller supports the interfaces in this manual and strictly observes all requirements and limitations
stipulated in the controller and the drive.
The built-in Modbus RTU (remote terminal unit) is designed to communicate with any controller that supports the interfaces defined in
this manual. It is assumed that the user has full knowledge of the capabilities and limitations of the controller.
9.6.2 Overview
Regardless of the type of physical communication networks, this section describes the process that a controller uses to request access to
another device. This process includes how the Modbus RTU responds to requests from another device, and how errors are detected and
reported. It also establishes a common format for the layout and contents of telegram fields.
During communications over a Modbus RTU network, the protocol:
l Determines how each controller learns its device address.
l Recognizes a telegram addressed to it.
l Determines which actions to take.
l Extracts any data or other information contained in the telegram.
If a reply is required, the controller constructs the reply telegram and sends it.
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