Mode Default Behaviour
Auto (Remote) In this operation mode the UMC accepts start commands from the DCS/PLC. To activate this control mode the "Auto Mode Bit" in the
cyclic communication telegram must be set to logic one.
No start commands from other control sources are accepted in this mode.
Local 1 In this mode the motor is controlled locally at the motor or the motor control room. Start commands are accepted from the digital
inputs or the LCD control panel. This mode is active in the following cases:
If the "Auto Mode Bit“ in the cyclic bus telegram is not set i.e. the PLC/DCS has enabled local control.
If the LCD panel is used to control the motor locally.
As soon as the menu point "Motor Control" is entered and the UMC signals local control
If the UMC detects a bus fault
Local 2 Is a second local control mode that can be activated via one of the multifunction inputs even if another mode is active. This allows
local control to be enforced via digital inputs without involvement of the
PLC/DCS (i.e. the "Auto Mode Bit" is ignored).
How to set the mode:
There are three relevant signals that determine which mode is active:
• Bus fault: The UMC has detected a bus fault (i.e. the cyclic bus master is missing)
• Force Local 2: A multifunction input signals that the local 2 mode shall be activated
• Autobit: With bit 5 in byte 0 of the cyclic command telegram, the PLC/DCS signals that the auto mode shall be activated and
control shall happen via bus (according to PNO motor management profile).
The following table shows the activated operation mode depending on these inputs.
There is always one mode selected even if more than one input is active.
The bus fault signal has the highest priority followed by the force local 2 signal. The autobit has lowest priority.
Bus fault (e.g. no sign of life from master)
x
Autobit is set to true on fieldbus x x
Resulting Mode Auto
x: Either 0 or 1
Mode selection table. Based on the three inputs the active mode is selected
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