Packet Structures; Ensuring Safe And Successful Control; Control Commands (Write Only); Status Commands (Read Only) - Danfoss VLT MCD 201 Installation Manual

Packet Structures

7 Packet Structures

7.1 Ensuring Safe and Successful Control

Data written to the PROFINET Module remains in its
register until the data is overwritten or the module is
reinitialized. The PROFINET Module does not transfer
successive duplicate commands to the soft starter.
•
If the soft starter is started via fieldbus communi-
cation but stopped via the LCP or a remote input,
an identical start command cannot be used to
restart the soft starter.
•
If the soft starter is controlled via the LCP or the
remote inputs (and via fieldbus communications),
a control command should be immediately
7 7
followed by a status query to confirm that the
command has been actioned.
NOTICE
Functions available only in VLT
•
Parameter management.
•
Dual motor control.
•
Digital inputs.
•
Jog.
•
Current measurement in amperes.
•
Power information.
•
Warnings.
NOTICE
®
VLT Compact Starter MCD 201 open-loop soft starters
do not support motor current and motor temperature
information.
12
PROFINET Module
®
Soft Starter MCD 500:
Danfoss A/S © 11/2017 All rights reserved.

7.2 Control Commands (Write Only)

Use the following structures to send a control command to
the soft starter:
Byte Bits Details
0 0–1 Reserved.
2–3 0 = Use soft starter remote input to select motor set.
1 = Use primary motor set when starting.
2 = Use secondary motor set when starting.
4 = Reserved.
4 0 = Stop action is a soft stop (as selected on the soft
starter).
1 = Stop action is a quick stop (coast to stop).
5–7 Reserved.
1 0 0 = Stop
1 = Start
1–2 Reserved.
3 1 = Reset.
4–7 Reserved.
Table 7.1 Control I/O Data Structure

7.3 Status Commands (Read Only)

Soft starter status information is always available when the
device is connected to a soft starter.
NOTICE
For models MCD5-0053B and smaller (soft starter model
ID 1–4), the current reported via communication
registers is 10 times greater than the actual value.
7.3.1 Bytes 0–1: Control Status
Bits Details
0–5 Motor current (%FLC).
6 Command source
0 = Hand On.
1 = Auto On.
7 1 = Ramping (starting or stopping).
8 1 = Ready.
9 1 = Starting, running, or stopping.
10 1 = Tripped.
11 1 = Warning.
12–15 Reserved.
Table 7.2 Description of Bytes 0–1
MG17P102