Read the case study: https://www.opto22.com/support/resources-tools/documents/2180-case-study-california-controlled-atmosphere (https://www.opto22.com/support/resources-tools/documents/2180-case-study-california-controlled-atmosphere)
How do you get fresh apples in March? CalCA knows the secret: strictly controlled storage. Central California farmers produce the bulk of the nation's fruits and vegetables. And employee-owned California Controlled Atmosphere (CalCA) in Dinuba, California, is widely recognized as the area's leader in industrial refrigeration services.A third-generation farmer and pomologist, Doug Gerdts knows fruit. He also knows control programming.
"With Opto 22 we’ve been able to maintain systems for a long period of time," says Gerdts. "The I/O is very hardy. We’re able to do most of our controls directly through the output modules without any interposing relays."