Presse universelle MecaMotion par 

PROFINET press control FB

To facilitate the control of the press from a PLC, we have developed a function block (FB_MecaMotion_press).

This one includes all PROFINET inputs and outputs required to control the press.

List of block inputs and outputs

Table 1: Designation of the inputs/outputs of the block

Siemens PLC

On the "Hardware_identifier_presse_inputs" and "Hardware_identifier_presse_outputs" inputs, you must give the hardware identifier of the Profinet input and output range in decimal format.

When using a Siemens PLC, you must use a data block to write/read user variables. This block must have the following structure and must be transferred to the "DB_setpoints_results" input.

Structure of the setpoints / results DB:

Table 2: Structure of the setpoint / result data block under Siemens

Beckhoff PLC

In the FB "MecaMotion Press" for Beckhoff PLCs, the declaration of the Profinet input and output ranges is done via 2 Bytes tables of length 254.

When using a Beckhoff PLC, user variables are written/read via tables.

Table 3: Setpoints/results tables with Beckhoff PLC

FB errors

In addition to the Profinet press errors listed in the "PROFINET error list" topic, the errors below may appear, these errors are part of the Boolean structure of the "Errors_messages" output. If you use a Siemens PLC, the structure must have 120 Booleans.

Table 4: Internal errors in the functional block

Error acknowledgement

To acknowledge the errors, you must set the "Ack_error" input to "1". (Rising edge detection)

Operating mode changing

There are 2 possible operating modes, manual = 1 or automatic = 2.

To activate one of these modes, you must write one of the values listed above in the "Operating_mode" input byte. You can then check that the mode has been activated, using the output byte "Actual_operating_mode".

Positionnement manuel

To perform manual positioning, you must enter the following input parameters:

•Manual_positioning_relative_mode (absolute=0, relative=1)

•Manual_position (position setpoint [mm])

•Manual_speed (speed setpoint [mm/s])

•Manual_acceleration_deceleration (acceleration and deceleration setpoint [mm/s2])

Once these parameters have been entered, you can start positioning using the "Start_manual_positioning" input, this input must be maintained to "1" until the "Manual_position_reached" output becomes true. Then, when you reset the "start" input, the output "Manual_position_reached" becomes false too. You can then perform a new positioning.

Run on sight (JOG)

The "Jog_downwards" and "Jog_upwards" inputs are used to move axis in run on sight. As long as the input is true, the axis moves, otherwise it stops.

Be careful, you must enter a speed in the "Manual_speed" input parameter for the movement to take place.

Position initiale et position de dégagement

Go to the initial position (manual or automatic mode): The "Go_to_initial_position" input allow to move axis to the initial position entered in the parameters from MecaMotion. This input must be maintained to "1" until the "Initial_position_reached" output becomes true. It means that the positioning is finished, you can then reset the input and the output will also reset.

Go to the release position (manual or automatic mode): The "Go_to_release_position" input allow to move axis to the release position entered in the parameters from MecaMotion. This input must be maintained to "1" until the "Release_position_reached" output becomes true. It means that the positioning is finished, you can then reset the input and the output will also reset.

Stop movement

In manual or automatic mode, when a rising edge is detected on the "Stop_movement" input, the axis stops and the program execution is paused.

Movement resumption

The resumption of axis movement and program execution takes place when a rising edge is detected on the "Continue_movement" input. (Manual or automatic mode)

Force sensor management

To reset the force sensor, you must set the "Reset_force_sensor" input to "1". The reset is performed for 200[ms] after detecting a rising edge on the input.

To change the range of the force sensor, you must enter the number of the range you want to activate in the "Force_sensor_range" input byte. When you change the range of the force sensor, it is reset for 500[ms].

Program changing

To activate a program, simply enter its number in the "Program_number" input byte. You can then check whether the program has been activated using the "Actual_program_number" output.

Starting the actual program

To start the actual program, the "Program_running" and "Error" outputs must be "false". Then you must activate the "Start_program" input and keep it active until the "Program_finished" output becomes true. When the program is finished, you can reset the "Start_program" input and the "Program_finished" output will also be reset. You can then restart the program.

Envelope changing

To select and activate an envelope, you must enter its number in the "Envelope_number" input byte. You can check that the selected envelope has been activated using the output byte "Actual_envelope_number".

You can activate or deactivate the envelope control at any time using the "Envelope_monitoring" input. This input must be set to "1" for the control to be active.

Break points

If you use the breakpoint instruction in your program, you have the choice to make or not the break during program execution.

To activate the breakpoints you must set the "Enable_breakpoints" input to "1". When the program execution is stopped at a breakpoint, the output "Program_on_breakpoint" changes to "1". You can continue running the program by activating the "Continue_after_breakpoint" input (rising edge detection).

Stopwatches

If you use the stopwatch instruction in your program, you can view the running stopwatches at any time using the "Stopwatch_..._running" outputs.

Press technology data

You can view at any time the position and speed of the axis, the measuring sensor value and the force value using the following outputs:

•"Actual_position" [mm] REAL Format

•"Actual_speed" [mm/s] REAL Format

•"Actual_measuring_sensor_value" [mm] (option) REAL Format

•"Actual_force" [N] REAL Format