For production lines with simple control requirements, the Allen Bradley SLC range will probably be sufficient. If the conveyor is particularly lengthy, its possible remote racks would be cheaper than long cable runs. More complicated production lines may require a PLC.
If the production line is required to produce different product, more than one line speed may be necessary. The Allen Bradley 1201 Drive Controller can accept parameters for acceleration and speed from the PLC. In such a scenario, the HMI and PLC can be designed to store multiple profiles, one for each product type. This means that transferring from one product type to another can be a matter of a few key strokes.
Greysoft can produce software for any production line or conveyor system.