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Difference in S7 300 and S7 400

Created by: mohit at: 7/8/2009 9:30 PM (29 Replies)

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6/27/2013 6:34 PM	Rate (0)
RKM Posts: 93 Rating: (13)	Dear all, apart from mentioned detailed differences , main and most important difference of both systems is diagnostics capability. Capacity of diagnostics the problem of itself,its module,its program error, communicaion error, its support system (BAttery for ram, supply voltage, battery life, back plain supply)error , etc are very high in 400. and it has so many LEDs on its CPU to announciate its diagnostics.
RKM Posts: 93 Rating: (13)
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6/27/2013 6:56 PM	Rate (0)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	RKM Dear all, apart from mentioned detailed differences , main and most important difference of both systems is diagnostics capability. Capacity of diagnostics the problem of itself,its module,its program error, communicaion error, its support system (BAttery for ram, supply voltage, battery life, back plain supply)error , etc are very high in 400. and it has so many LEDs on its CPU to announciate its diagnostics. ve Hello, I have gone through this entire thread for the difference between S7300 & S7400 PLC. But I noticed that one more very important factor between this two PLC is missing!!!!!!!!!!!!! It is a cost factor. due to that sometimes we have to manage with S7300 PLC just to grab the order with high competition in market.
	VANDE MATARAM.....
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6/27/2013 6:59 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (999)	Amit_86 .... It is a cost factor. due to that sometimes we have to manage with S7300 PLC just to grab the order with high competition in market. Hmmm... I can not fully agree. Just one example: a CPU 319 is much more expensive than a 414
IBN-Service Posts: 8946 Rating: (999)
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6/27/2013 7:28 PM	Rate (0)
DS SURESH KUMAR Bronze Member Joined: 4/17/2012 Last visit: 8/30/2024 Posts: 474 Rating: (10)	Hi, In ST 70 catalogue you will get all the PLC specification with MLFB number....

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6/27/2013 7:35 PM	Rate (0)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	IBN-Service Amit_86 .... It is a cost factor. due to that sometimes we have to manage with S7300 PLC just to grab the order with high competition in market. Hmmm... I can not fully agree. Just one example: a CPU 319 is much more expensive than a 414 Thank you for information. i would like to know many more if not here than via PM
	VANDE MATARAM.....
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6/27/2013 7:38 PM	Rate (0)
ALGUDKAR RAO Posts: 621 Rating: (10)	mohit What is the difference in the CPU-315 and CPU-317. y hello tjere is a difference between these 2 cpu memory size work memory and program memory if u want more cpu and modules please refer the siemens catalog.
ALGUDKAR RAO Posts: 621 Rating: (10)
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6/28/2013 6:29 AM	Rate (0)
viralpatel Silver Member Joined: 11/18/2010 Last visit: 8/5/2022 Posts: 523 Rating: (32)	mohit What is the difference in the CPU-315 and CPU-317. hi , please see below doc S7 300 series Controllers viral patel

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7/1/2013 9:51 AM	Rate (0)
corleone Posts: 39 Rating: (1)	The S7-300 is considered a mid-level controller, using a serial bus (the modules are connected through a bus connector), with lower memory size and lower transaction speeds than their S7-400 counterparts. They come in a smaller footprint that the S7-400s. The S7-400 CPUs are generally more powerful and faster than the S7-300, and use a rack-based parallel bus that allows faser comms between the CPU and its modules. The S7-400 is the only Siemens CPU that can be mounted in a hot-redundant (hardware) configuration (with specific CPUs involved here, known as S7-400H systems). Siemens also proposes PCS 7, a DCS equivalent based on S7-400 hardware and integrating WinCC as a distributed display and supervision system. S7-300 CPUs can participate in the system, but not as main DCS controllers. That being said, the newer modules of S7-300 (S7-317and S7-319) are quickly becoming as fast and as powerful as the lower range S7-412 CPUs, so the distinction is starting to blur a bit). Thanks nd regards
corleone Posts: 39 Rating: (1)
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10/18/2017 7:54 AM	Rate (1)
Ms. Jewel Posts: 1 Rating: (1)	S7 300 based on serial communication system and S7 400 based on parallel communication system.
Ms. Jewel Posts: 1 Rating: (1)
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11/18/2017 11:44 PM	Rate (0)
snoop13014 Bronze Member Joined: 10/25/2016 Last visit: 9/1/2022 Posts: 199 Rating: (25)	Hi, - The Multi-computing is possible on S7-400 and not on S7-300 - 4 accumulators on S7-400 and 2 on S7 300, so it's possible on S7 400 to use the instruction "leave" and "ENT" and the way to calculate an Arithmetic operation is not the same on S7 400, so S7 300 program can't work correctly on S7 400 due to the difference of accumulators. - On S7 400 CiR (Configuration in Run) is possible using OB83 (Insert/Remove Module Interrupt), it's possible to replace module during operation avoiding CPU fault. - "Process image partition" is availlable - Hot Restart and Cold restart are availlable on S7 400 And so many other option... Regards

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