Plc

Dear Guys,
Iam using siemens S7-300 series,CPU-313 plc for our Bagging M/c.I don't have software for that PLC only having hard copy ladder logic programe.I have a doubt in OB1 programe Block.The two network have given below,

Network:2

O "FIXED_O" M199.0 -- GC FLAG FIXED O
ON "FIXED_O" M199.0 -- GC FLAG FIXED O
R "FIXED_O" \\ FESTE O M199.0 -- GC FLAG FIXED O

O "FIXED_1" M199.1 -- GC FLAG FIXED 1
ON "FIXED_1" M199.1 -- GC FLAG FIXED 1
S "FIXED_1" \\ FESTE 1 M199.1 -- GC FLAG FIXED 1

O "TEST_O" M99.0 -- GC FLAG TEST O
ON "TEST_O" M99.0 -- GC FLAG TEST O
R "TEST_O" \\ TEST O M99.0 -- GC FLAG TEST O

O "TEST_1" M99.1 -- GC FLAG TEST 1
ON "TEST_1" M99.1 -- GC FLAG TEST 1
S "TEST_1" \\ TEST 1 M99.1 -- GC FLAG TEST 1

Network:3
"DB_TIMERS

-------------------------------------------------< OPN >--------


I can't able to understand the meaning of above written two network,can any one know please help me.
thanks,

Regards,
S Shanmugam

Shan:

The first 3 lines of Network 2 will make sure "FIXED_0" is always off (OR FIXED_0 OR NOT FIXED_0 then RESET FIXED_0). The next 3 lines make sure "FIXED_1" is always on (OR FIXED_1 OR NOT FIXED_1 then SET FIXED_1). The next 2 flags are controlled the same way. Network 3 opens the "DB_Timers" data block. This lets you address elements in the DB without specifying the data block in the address (similar to the "old" S5 way of doing it).

Rob

plc

Rob:

Just now i have seen your reply,I understood what you written.Thank you very much.

Shan