Equipments (Devices) > CFW300 > Ladder > Motion Control > MW

This block sends speed reference to drive.

Ladder Representation

MW_RefVelocity

Block Structure

Variable Type

Name

Data Type

Description

VAR_INPUT

BOOL

Block enabling

Velocity

DINT INT REAL

Sets speed reference to drive if block is enabled

VelocityUnit

0 = 13Bits

1 = RPM

2 = HZ(x10)

Sets the speed unit:

13 Bits – Sends the speed value in 13 bits;

RPM – Sends the speed value in RPM;

HZ – Sends the speed value in Hz (x10).

RunAutomatic

0 = FALSE

1 = TRUE

Define if block will run the Run/Stop (CFW_CMD_RUN_STOP) when it is enabled:

FALSE – Do not send Run/Stop command with block enabling (it is necessary to use the marker CFW_CMD_RUN_STOP in ladder's logic to send the Run/Stop command);

TRUE – Send Run command with block enabling and Stop command with block disabling.

VAR_OUTPUT

ENO

BOOL

End of operation. Conditions for ENO = 1

•	Does not exist another active block MW_RefVelocity;

•	Drive is enabled and stop mode set "Stopping by inertia".

Operation

When this block has a "0" value in EN, it does not execute and ENO output is zero.

RunAutomatic = TRUE

When this block has a "1" value in EN input, the drive is general enabled, no other motion block is active, the Run/Stop command goes to "1", the speed reference value is send to drive and the ENO output is set to "1".

If EN input has a "0" value, and this block is active, the Run/Stop command is set to "0" and ENO output goes to "0".

RunAutomatic = FALSE

When this block has a "1" value in EN input, the drive is general enabled, the Run/Stop command is set to "1", no other motion block is active, the speed reference value is send to drive and the ENO output is set to "1".

If EN input has a "0" value and this block is active, ENO output is set to "0".

NOTE!

Check the source of speed reference and command Run/Stop for correct operation of this block

Block Flowchart

MW_RefVelocity_flowchart

Example in Ladder

MW_RefVelocity_example01

MW_RefVelocity_example02

The above example shows the MW_RefVelocity block, set to Hz and the RunAutomatic command in TRUE, if drive is general enabled and the block is enabled, the speed reference is changed.

MW_RefVelocity_example03

MW_RefVelocity_example04

The above example shows the MW_RefVelocity block, set to Hz and RunAutomatic command in FALSE, if drive is general enabled, it is necessary the Run command. So, when the block be enabled, the speed reference would be changed.

Example in ST

The example below displays the instructions for applying the example above in the ST language.

VAR

ENABLE_BLOCK : BOOL;

SPEED : INT;

END_VAR

FB_MW_RefVelocity(

EN:=ENABLE_BLOCK,

Velocity:=SPEED,

VelocityUnit:=2,

RunAutomatic:=0);