Danfoss VLT Soft Starter MCD 600 Manual de instalação - Página 8
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Modbus RTU Card
Installation Guide
4 Operation
4.1 Prerequisites
The Modbus RTU Card must be controlled by a Modbus client (such as a PLC) which complies with the Modbus Protocol Specifica-
tion. For successful operation, the client must also support all functions and interfaces described in this manual.
4.2 Client Configuration
For standard Modbus 11-bit transmission, configure the client for 2 stop bits with no parity and 1 stop bit for odd or even parity.
For 10-bit transmission, configure the client for 1 stop bit.
In all cases, the client baud rate and server address must match those set in parameters 12-1 to 12-4.
The data polling interval must be long enough for the module to respond. Short polling intervals may cause inconsistent or incor-
rect behavior, particularly when reading multiple registers. The recommended minimum polling interval is 300 ms.
4.3 Configuration
4.3.1 Modbus Network Settings
Set the network communication parameters for the card via the soft starter. For details on how to configure the soft starter, see the
VLT® Soft Starter MCD 600 Operating Guide.
Table 1: Parameter Settings
Parameter
Parameter name
12-1
Modbus Address
12-2
Modbus Baud Rate
12-3
Modbus Parity
12-4
Modbus Timeout
4.3.2 Enabling Network Control
The soft starter only accepts commands from the expansion card if parameter 1-1 Command Source is set to Network.
If the reset input is active, the soft starter does not operate. If a reset switch is not required, fit a link across terminals RESET, COM+
on the soft starter.
4.4 Feedback LEDs
LED status
Off
On
Flashing
If communication is inactive, the soft starter may trip on Network Communications. If parameter 6-13 Network Communications is
set to Soft Trip and Log or Trip Starter, the soft starter requires a reset.
8 | Danfoss A/S © 2022.11
Description
Sets the Modbus RTU network address for the soft starter.
Selects the baud rate for Modbus RTU communications.
Selects the parity for Modbus RTU communications.
Selects the timeout for Modbus RTU communications.
N O T I C E
Description
The soft starter is not powered up.
Communication active.
Communication inactive.
N O T I C E
Operation
AQ277154312778en-000201 / 175R1180