Siemens R15E02-186 is a printed circuit board module (digital board) manufactured by Siemens for use in its automation equipment. Variants exist, including R15E02-186A and R15E02-186B; some listings refer to the same component simply as R15E02-186. Distributors also market refurbished units, for example York Controls lists a refurbished '37018U' Digital Board R15e02-186. You can also find the part listed as R15E02-186A on reseller sites such as PLC Direct.
