Motor Control Sequencing

[REC 0]

I'm new to Siemens software with little PLC programming experience, but the only mechanic with any experience at all.  So here it goes.  Our plant has equipment using S7 1200 PLC (TIA Portal V13 and Startdrive) and three G120C PN drives controlling conveyors.  Currently the drives are controlled through an HMI to control the speed.  We need to be able to slow the speed of these conveyors automatically after an external counter reaches a predetermined set point so an elevator can empty the product and return to the up position then return the speed control back over to the HMI set points.     

We are using a Red Lion counter with a preset count for counting boxes.  When the preset count is reached it will send an output signal to the S7 1200 PLC to slow down the roller conveyors and the counter will reset to ZERO automatically to count the next batch.  After the elevator empties the load and returns to the up position and makes contact with the UP limit switch we need the Conveyors to return to the normal running speed.

Any help would be appreciated.

[IlFincoITA 0]

Hi! How are you controlling the G120 C? I mean into the PLC program. Are you using SINA_SPEED FB? Wich telegram is configured for PN communication? You have just to move a new value as a reference speed... it isn't difficult...