Hello Sir

i want to ask about progamming with IO redundant capability, i have S7-412-5 with redundant config and the IO using IM module and ET200M type, the module for DI is redundant type, i already setup the module for redundant configuration, and i want ask about the programming cause i still dont have the module right now for simulation. when I setup DI for redundant I have address from 0-1 in module 1 and 2-3 in module 2, this module work in "and" config, so when one channel get input for field device must i check for 2 address (1 module 1 address) in same time or just one address only in one module?

and i have config FB RED_IN in pip 1 that called in cyclic intrup, are this one is true?

thank you 
fernando 

mopS04

hi fernando13,

for two redundant inputs you don´t have to use both in PLC programm.

Redundancy means that you have two HW-modules, one is active and the other is for backup. when the active one fails, the backup-HW is continuing the work on the point, where the other one dropped out. Both modules are connected to sychronize. There is one programm running one both PLCs that uses one address for a redundant HW.

I recommend you to have a look into the S7400H manual.

hope this helps,

regards,

 Hi mopS04

thank you for the answer but i still confuse about one address for redundant HW, how to get the address, are the address create automatic inside the CPU and how to read this.

can you give me some example program where to read this address

thank you