Product code : 6ES7 321-1CH20-0AA0 (SM321, 16DI, DC48-125V)
Brand : siemens
SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24 V DC, 1x 20-pole, 0.05 ms input delay
look to all details: https://mall.industry.siemens.com
and here you will find Similar items : https//www.ugarit-elektrik.com/s300
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