Only one serial link communication cartridge can be added to the front of TM221C*** controllers, even if the controller has two cartridge slots.
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If this FAQ did not solve your issue, you can chat with us at chat with us or e-mail us at customer.services@se.com to create a case with our Technical Support Team.
If you are not located in North America, please contact your local Customer Care Center for assistance:
Support | Schneider Electric Global (se.com)