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Programming
Function:
This parameter can be read out via the serial communi-
cation port.
Description of choice:
The value shown indicates the signal value on terminal 1.
3
3
The scaling (parameters 336 and 337) does not influence
the read-out. Min. and max. are determined by the offset
and gain adjustment of the AD-converter.
This value is updated every 20 ms.
543
Data read-out: Terminal 2, analogue input
Value:
Unit: X.X V
Function:
This parameter can be read out via the serial communi-
cation port.
Description of choice:
The value shown indicates the signal value on terminal 2.
The scaling (parameters 338 and 339) does not influence
the read-out. Min. and max. are determined by the offset
and gain adjustment of the AD-converter.
This value is updated every 20 ms.
561
Protocol
Value:
FC protocol (FC PROTOKOL)
Modbus RTU
Function:
There is a choice of three different protocols.
Description of choice:
Select the required control word protocol.
For further information about using the Modbus RTU, see
MG10SX.
570
Modbus parity and message framing
Value:
(EVEN/1 STOPBIT)
(ODD/1 STOPBIT)
(NO PARITY/1 STOPBIT)
(NO PARITY/2 STOPBIT)
Function:
This parameter sets up the drive's Modbus RTU interface to
communicate properly with the master controller. The
parity (EVEN, ODD, or NO PARITY) must be set to match
the setting of the master controller.
Description of choice:
Select the parity that matches the setting for the Modbus
master controller. Even or odd parity is sometimes used to
allow a transmitted word to be checked for errors. Because
Modbus RTU uses the more efficient CRC (Cyclic
Redundancy Check) method of checking for errors, parity
checking is seldom used in Modbus RTU networks.
74
®
VLT
DriveMotor FCM Series
NOTICE
Any change will disable use of display unit (LCP2), and
further programming also by FC protocol.
571
Value:
10 ms-2000 ms
Function:
This parameter determines the maximum amount of time
that the drive's Modbus RTU will wait between characters
that are sent by the master controller. When this amount
of time expires, the drive's Modbus RTU interface will
assume that it has received the entire message.
Description of choice:
Generally, the value of 100 ms is sufficient for Modbus RTU
networks, although some Modbus RTU networks may
operate on a timeout value as short as 35 ms.
If this value is set too short, the drive's Modbus RTU
interface may miss a part of the message. Since the CRC
check will not be valid, the drive will ignore the message.
The resulting retransmissions of messages will slow
communications on the network.
If this value is set too long, the frequency converter will
wait longer than necessary to determine that the message
is completed. This will delay the drive's response to the
[0]
message and possibly cause the master controller to time
[2]
out. The resulting retransmissions of messages will slow
communications on the network.
3.8.1 Parameter Group 6-** Technical
600
Value:
Unit: hours
0.0-130,000.0
[0]
Function:
[1]
This parameter can be read out via the display or the serial
[2]
communication port. The value cannot be reset.
[3]
Description of choice:
Indicates the number of hours in which the FC motor has
been switched on.
The value is updated in the FC motor every hour and
saved when the unit is turned off.
601
Value:
Unit: hours
0.0-130,000.0
Function:
This parameter can be read out via the display or the serial
communication port. The value can be reset via parameter
619.
®
MG03BA02 - VLT
is a registered Danfoss trademark
Modbus communications timeout
Functions
Operating data: Operating hours
Operating data: Hours run
100 ms
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