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Number of Analog channels can be used in CPU414H

Created by: ROCLIM at: 9/26/2010 2:10 PM (2 Replies)

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9/26/2010 2:10 PM	Rate (0)
ROCLIM Posts: 42 Rating: (1)	Hi I am not sure about the margin of process image available for using high variety of analog inputs.(81024/2)= 4096 word is available to be used as Analog input? this is spec of CPU. 6ES7 414-4HJ04-0AB0 Redundant and fail-safe capable, work memory 0.7MB code and 0.7MB of data; 0.08 ms/1000 instructions; 8KB DI/O; 32 connections; 1DP/MPI, 1*DP and 2 receptacles for H Sync modules; firmware V4.0
ROCLIM Posts: 42 Rating: (1)
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9/26/2010 11:40 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/16/2024 Posts: 12294 Rating: (2691)	Hello Roclim; Based on the information in a 2007 “Automation System S7-400H Fault-tolerant Systems” manual, theCPU414-4HJ04can handle 4096 analog channels: 15.1 Technical Specifications of the CPU 414-4H Digital channels Max. 65536/Max. 65536 • those central Max. 65536/Max. 65536 Analog channels Max. 4096/Max. 4096 • those central Max. 4096/Max. 4096 Hope this helps, Daniel Chartier

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9/27/2010 10:33 AM	Rate (0)
H-H Platinum Member Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (309)	Hello ROCLIM, As Daniel has already said, the CPU can address 4096 channel but I highly doubt that you can use them altogether in a single CPU. The problem will be in CPU's memory and also your method of programming. There are also some other issues that make it very hard to have 4096 in a single CPU like bus update time and cycle time. Ifyou compare your CPU (which is no longer available)to the latest 414-H CPU, you will find that Although the latest CPU has double memory and can execute code faster, the addressable area hasn't been changed and it's still (4096 channel) and I still believe that it's not applicable to use 4069 analog channel inlatest CPU. By taking a look at this PCS7 brochure, you will see that they way of programming in PCS7 limits the CPU to the numbers that are written in page 41. I'm sure that any method of programming rather than CFC - PCS7 may give you more than these numbers for the memory capacity this CPU has. But still, the memory capacity still limits the use of the whole 4096 channels. Best regards. H-H

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