The 6100 plus, 8100 plus, 4100 plus control have many output and optional hardware configurations. In order to quote you on a new control we need more information.
If you have an existing 'Plus' control then follow the instructions at the following link so that we can determine the hardware that you have installed in your control:
On new or existing applications we can help you select the proper control based on your input and output requirements. Please advise with a detailed application description along with any special requirements that you may have.
Pricing can also be found at the following web page. Be sure to select the required input , output and option requirements to display the price for the control that will match your requirements.