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6ES7221-1BF32-0XB0 Siemens | Siemens PLC I/O Module for use with SIMATIC S7- 1200 Series, 100 x 45 x 75 mm, Digital, Digital, M241, 24 V dc, SIMATIC | 787-7942 | RS Components
Safety Applications with S7-1200 FC CPU - ID: 109478932 - Industry Support Siemens
Using a Simatic PLC as IO controller — p-net documentation
6ES7241-1CH30-1XB0 Simatic S7-1200, Communication Board CB1241, RS485, screw clamp, supports message based freeport, Siemens Elit GlobalStore™ - Electrical and automation components, PLC, HMI Distributor
Modbus TCP/IP to Siemens Industrial Ethernet Gateway - ProSoft Technology, Inc.