Siemens 6ES7921-5AB20-0AA0 Front connector module with 4x16 pole IDC connector for digital 32 I/O modules (Siemens 6ES79215AB200AA0)
Siemens 6ES7921-5AD00-0AA0 Front connector module with 1x16 pole IDC connector for digital 2 A output modules (Siemens 6ES79215AD000AA0)
Siemens 6ES7921-5AH20-0AA0 Front connector module with 4x16 pole IDC connector for digital 32 I/O modules (Siemens 6ES79215AH200AA0)
Siemens 6ES7921-5AJ00-0AA0 Front connector module with 1x16 pole IDC connector for digital 2 A output modules (Siemens 6ES79215AJ000AA0)
Siemens 6ES7921-5AK20-0AA0 Front connector module with 4x16 pole IDC connector for analog 40 pole I/O modules (Siemens 6ES79215AK200AA0)
Siemens 6ES7921-5CB20-0AA0 Front connector module with 1x50 pole IDC connector for digital 32 I/O modules (Siemens 6ES79215CB200AA0)
Siemens 6ES7921-5CH20-0AA0 Front connector module with 1x50 pole IDC connector for digital 32 I/O modules (Siemens 6ES79215CH200AA0)
Siemens 6ES7921-5CK20-0AA0 Front connector module with 1x50 pole IDC connector for analog 40 pole I/O modules (Siemens 6ES79215CK200AA0)