ACSM1_ACCESS_dc Driver Unit in Decentralized Motion Control

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Function Block ACSM1_ACCESS_dc

To make this Function Block work, the following additional information should be considered:

Realization with ACS35x on PROFIBUS-DP network

Realization with ACS35x on PROFIBUS-DP network

This Function Block is used as driver unit for PLCopen Function Blocks with ACSM1 in decentralized Motion Control.

During normal operation, the drive will be completely controlled by the fieldbus interface. For safety reasons, this could be combined with additional measures through binary inputs on the drive. So the drive would be in defined state when the fieldbus is not yet initialized or in case of communication problems. For coordination, the inputs OFF1, OFF2 and OFF3 are available at the driver unit Function Block ACSM1_ACCESS_dc. Adjust parameters in Group 10 of the drive when this additional control should be used. Then connect the binary values OFF1, OFF2 and OFF3 to the respective inputs.

When the fieldbus interface is ok (shown by REMOTE_OK) OFF1, OFF2 and OFF3 should be switched to TRUE before the MC_Power Function Block is enabled. When an emergency stop should be executed, the sequence depends on the required Stopping mode. (Details can be found in the drive manual.)

The priority of the signals is as follows: OFF2 > OFF3 > OFF1

Caution

When switching off the drive ACSM1 via the MC_Power and ACSM1_ACCSESS_dc blocks, the drive is completely switched off. This results in limited use of the “brake holding function” of the drive, as for example the drive parameter 35.04 BRAKE CLOSE DELAY is no longer effective. This can result in increased wear of the holding brake depending on the application, in particular with suspended loads.

  1. Use this sequence to power on the drive.

  2. Use the following sequence to power on the drive:

    Set OFF1 or OFF2 or OFF3 or a combination to FALSE, depending on required stop mode. This will already reset the internal power-on statemachine to the respective state and change the signals in the fieldbus CW (control word). In addition, disable the MC_Power Function Block. A sequence for these two actions is not required, but the MC_Power will show an error message when it is not disabled while the drive is already stopped.

Note

If the Enable input at MC_Power is set to FALSE, bit 3 (ENABLE) in the control word is set to zero.

  • If the input OFF1 at the block ACSM1_ACCSESS_dc is set to FALSE: Bit 3 (ENABLE) and Bit 0 (OFF1) in the control word are set to zero.
  • If the input OFF2 at the block ACSM1_ACCSESS_dc is set to FALSE: Bit 3 (ENABLE) Bit 0 (OFF1) and Bit 1 (OFF2) in the control word are set to zero.
  • If the input OFF3 at the block ACSM1_ACCSESS_dc is set to FALSE: Bit 3 (ENABLE), Bit 0 (OFF1), Bit 1 (OFF2) and Bit 2 (OFF3) in the control word are set to zero.