Moustafa Elsherief
Member
guys could any one tell me the differance between s7-300 and s7-400?
ifferance between s7-300 and s7-400?
- Thread starter Moustafa Elsherief
- Start date
L D[AR2P#0.0]
Lifetime Supporting Member
I made it -100
s7-400 - (s7-300) = s7 - s7 - 400 + 300 = -100
s7-400 - (s7-300) = s7 - s7 - 400 + 300 = -100
Paul B
Member
Well, I've never been shy about expressing an opinion so I'll get my feet wet first.
A lot of money.
The higher-end 300 processors are essentially 400 cpu's in a 300 chassis. I have done a few single panel applications that controlled an entire process - the entire room. One was a 318 and the other was a 317 cpu (more powerful than the 318) and both had resources to spare - 20% memory left with very fast scan times. Five or ten years ago this would have required 400 power but the newer 300 line is very powerful. The 319 blows everything away - though I haven't had a chance to use it yet.
PCS7 is Siemens' answer for DCS and it does not work with the 300. The 300 processors also don't support all the interrupts like the 400's, you get an OB35 and that's it. There are other differences of course and I'm sure more people will post.
A lot of money.
The higher-end 300 processors are essentially 400 cpu's in a 300 chassis. I have done a few single panel applications that controlled an entire process - the entire room. One was a 318 and the other was a 317 cpu (more powerful than the 318) and both had resources to spare - 20% memory left with very fast scan times. Five or ten years ago this would have required 400 power but the newer 300 line is very powerful. The 319 blows everything away - though I haven't had a chance to use it yet.
PCS7 is Siemens' answer for DCS and it does not work with the 300. The 300 processors also don't support all the interrupts like the 400's, you get an OB35 and that's it. There are other differences of course and I'm sure more people will post.
Peter Nachtwey
Member
The S7-400 has more accumulators to use as a stack. The S7-400 has 4 accumulator registers and the S7-300 has two. In theory one can keep more intermediate results in the S7-400 but to do so would mean the code wouldn't work on a S7-300.
In addition to what has already been written:
S7-400 supports RIUP.
S7-400H supports hardware redundancy.
The performance of the S7-400's backplane is much higher than the S7-300. This is especially important for network connections via CPs.
Btw. The 318 was a S7-400 CPU in an S7-300 body. The 317 and 319 are real S7-300 CPUs. So they dont have the 4-level accunmlator stack of the S7-400 for example.
S7-400 supports RIUP.
S7-400H supports hardware redundancy.
The performance of the S7-400's backplane is much higher than the S7-300. This is especially important for network connections via CPs.
Btw. The 318 was a S7-400 CPU in an S7-300 body. The 317 and 319 are real S7-300 CPUs. So they dont have the 4-level accunmlator stack of the S7-400 for example.
Well, I've never been shy about expressing an opinion so I'll get my feet wet first.
A lot of money.
The higher-end 300 processors are essentially 400 cpu's in a 300 chassis. I have done a few single panel applications that controlled an entire process - the entire room. One was a 318 and the other was a 317 cpu (more powerful than the 318) and both had resources to spare - 20% memory left with very fast scan times. Five or ten years ago this would have required 400 power but the newer 300 line is very powerful. The 319 blows everything away - though I haven't had a chance to use it yet.
PCS7 is Siemens' answer for DCS and it does not work with the 300. The 300 processors also don't support all the interrupts like the 400's, you get an OB35 and that's it. There are other differences of course and I'm sure more people will post.
S7300's will support more interrupts very soon.
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