Communication Problem S7-1200

[zubair136 0]

Dear Experts, 

i am facing a problem regarding plc to plc communication . 

i have 2 plc that are communicating through industrial switch . one plc is s7-1200 and second is Fatek FBS-40ma with FBS-CBE ethernet bd card.   both plc are connected to an ethernet industrial switch. Siemens HMi is also connected to that industrial switch as well. 

 

i have both plc programs back up. everything is running smooth but i want both plc as back up. so i bought both plc same model new one.

 

i have replaced the siemens plc with a new one and inserted program in it . everything works fine. but when i replace fatek plc with new one with program . siemens doesnot communicate with fatek.

 

any suggestion will be a life saving 

 

[zubair136 0]

one thing i forgot to mention . siemens plc is reading the modules of fatek plc