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| Part Number | CP521 |
| Description | Communications Processor Manual |
| Info | SIMATIC S5 CP 521 BASIC Communications Processor M. |
| Manufacture | SIMATIC |
| for PC | Download CP521 Datasheet |
| Part Number | CP521SI |
| Description | Communications Processor Manual |
| Info | SIMATIC S5 CP 521 SI Communications Processor Manu. |
| Manufacture | SIMATIC |
| for PC | Download CP521SI Datasheet |