The property posY represents the current rendering output Y position specified in 1/10 millimeters.

If the number is negative (-400) means that the signature filed will be placed 400 units from the top edge ot the page.

Example:

posX=500

posY=-400

If the number is positive (600) means that the signature field will be placed 600 units from bottom edge of the page.

Example:

posX=500

posY=600