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The Siemens 6ES7323-1BH01-0AA0 is a Simatic S7-300. 6ES73231BH010AA0 is a digital module SM 323, optically isolated, 8 DI AND 8 DO, 24V DC, 0.5A aggregate current 24, 1 x 20 PIN. 
The Siemens 6ES7323-1BL00-0AA0 is a Simatic S7-300. 6ES73231BL000AA0 is a digital module SM 323, optically isolated, 16 DI and 16 DO, 24V DC, 0.5A, aggregate current 4A, 1 X 40 PIN.