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Have a CMM321-KM ethernet module but can't find in the user's manual how to make it a slave. Need to poll it over a modbus TCP/IP network. Any help?
GE CMM321 used as Modbus TCP/IP slave!
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danw
Lifetime Supporting Member
It appears that Modbus slave/server operation is native, according the gfk1541b manual
http://support.ge-ip.com/support/index?page=docchannel&id=DO213
chapter 4 note:
(page 116)
http://support.ge-ip.com/support/index?page=docchannel&id=DO213
chapter 4 note:
(page 116)
I is a noob
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As in it needs to have an IP address that i can poll remotely to obatain vital information. The 8 page document that came with said device says that this version provides Modbus TCP/IP master and slave functions and refers to GFK-1541(b or newer) as the user manual. The one i found say nothing about slave options and is basicly a how-to on setting ths module up as a master.
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Once you have the IP address set, there shouldn't be anything you have to do to make it a server.
From GFK-1541B, page 1-2: "As a “server” the
Interfaces respond to requests from other devices such as PLC programming software, a Host
computer running an SRTP application, or another Series 90 PLC acting as a “client”. No PLC
programming is required for server operation."
From GFK-1541B, page 1-2: "As a “server” the
Interfaces respond to requests from other devices such as PLC programming software, a Host
computer running an SRTP application, or another Series 90 PLC acting as a “client”. No PLC
programming is required for server operation."
I is a noob
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Ok then its seems that it maybe an issue with my polling server/software. Thanks!
I is a noob
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OP
it was the register addressing that got me. I needed to look at appendix E to find this.
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