cip data table read/write

hokie

Member
H
Join Date
Aug 2005
Location
GA
Posts
76
Does anyone know what the maximum number of elements for a cip data read/write is? Is it documented somewhere?
I seem to be able to only ~100 before the MSG block errors out.
 
I might be talking about somthing completely different, but I've looked at CIP scattered read with controlLogix and Powerflex drives. The max is 132 bytes which is 66 words, or 22 parameters. Book is Ethernet IP adapeter - Powerflex 20-COMM-E

When the MSG has been read, and DN will be active, then you need to reset the EN. I only mention this as I couldn't find that documented anywhere.
 
hokie said:
Does anyone know what the maximum number of elements for a cip data read/write is? Is it documented somewhere?
I seem to be able to only ~100 before the MSG block errors out.
Click to expand...

I don't think there is a limit, CIP messages are "blocked" into 500 byte packages, and it may take several comms cycles to deliver all of the packages for a large message.

You may need to read the data into a buffer area, and use the message .DN bit to copy the received data into usable data areas to avoid "fragmented" data.
 
daba said:
I don't think there is a limit, CIP messages are "blocked" into 500 byte packages, and it may take several comms cycles to deliver all of the packages for a large message.

You may need to read the data into a buffer area, and use the message .DN bit to copy the received data into usable data areas to avoid "fragmented" data.
Click to expand...

Necropost alert!
 

Similar Topics

N
CIP Data Table Write CompactLogix to ControlLogix
I'm having trouble writing data from a CompactLogix PLC to a ControlLogix PLC. My CompactLogix (IP 192.1.5.70) configuration : Mu...
Replies
7
Views
3,076
Ken Roach
Ken Roach
J
CIP Data Table Read Instrucion Help......
Hello forum members. I was hoping if you guys can help me understand why this CIP instruction is error out with this code 16#000C.
Replies
1
Views
1,462
Archie
A
F
CIP Data Table Write
Hello everyone. I have a compactlogix L24ER PLC that I am trying to use to send data to a windows 10 PC. It works, but I want to understand why...
Replies
4
Views
2,408
Saffa
S
A
Concurrent CIP Data table messages
Hi everybody I wish you could help me with this: I have 4 CIP Data table read messages and 1 CIP Data table write message that communicates from a...
Replies
13
Views
3,927
Adrian Rios
A
S
Control Logix 5000 + CIP Data Table Write
Hi folks, I'm very much a newcomer to PLCs in general and the CIP standard in particular and have a problem I hope someone could shed some...
Replies
1
Views
7,562
RSL
R
Back
Top Bottom