Interposing relay blocks

johnjtaylor · Jun 3, 2008

I have been searching the net for relatively affordable plc interposing relay blocks with replaceable relays and fused outputs for easy maintenance. Din rail mounted circuit boards would be preferable. These are for Siemens plc transistor output cards. Siemens are a bit expensive for a tight budget.

Allan Barnes · Jun 3, 2008

Hello John,

I have use these field I/O blocks from Automation direct. These are nice because they are feild I/oso they can be used with most platforms.

http://web6.automationdirect.com/adc/Shopping/Catalog/Field_I-z-O/Terminator_I-z-O_Discrete_Output_Modules/T1K-08TRS

johnjtaylor · Jun 3, 2008

Thankyou Allan. Remote I/O are not applicable to this project though. I just want the wear and tear away from the plc if you know what I mean. I have saved the info for reference. Thankyou again.

Gil47 · Jun 4, 2008

In NZ these modules are available from TCS I have some in use and some on order they should fit most of your specs but as "$" are subjective I will leave that for you to follow up.

http://www.taitcontrols.co.nz/index.php?nav=under_construc&sub=Prod_PLCIOWiringSystem

http://www.taitcontrols.co.nz/index.php?nav=under_construc&sub=ProductListing&view=1&product_id=81&group_id=35

johnjtaylor · Jun 4, 2008

Thankyou very much. looks like what I was trying to find.

ndzied1 · Jun 4, 2008

If you are looling to save some space, Phoenix Contact has blocks with replaceable relays that are the width of a terminal block:
http://www.phoenixcontact.com/signal-level-matching/31255_31449.htm

They also have wiring systems which will go directly from the Siemens Card to a header which snaps onto a bank of the relays.

http://www.phoenixcontact.com/signal-level-matching/31257_30197.htm

I haven't seen combination devices with both a relay and fuse in one...

<disclaimer - I work for a Phoenix Contact distributor>

brucechase · Jun 4, 2008

johnjtaylor said:
Thankyou Allan. Remote I/O are not applicable to this project though. I just want the wear and tear away from the plc if you know what I mean. I have saved the info for reference. Thankyou again.

I'm curious why you don't want the plc to operate the device. The output will operate at the same frequency as the relay. If the current draw is too high or a different voltage, then I can understand, but to me wear and tear sounds more like just number of operations.

ndzied1 · Jun 4, 2008

I take it back, I did find one with relays and fuses:
http://www.phoenixcontact.com/signal-level-matching/31257_30197.htm

You have to go through the configuration to find it though. I couldn't find a direct link...

johnjtaylor · Jun 4, 2008

Hello ndzied1
The purpose of using a transistor output card and an interposing relay board so that if the relay was to burn out the relay can be unpluggged and replaced. With a plc relay output board the plc has to be shut down to replace the card affecting the delicate operation of the plant. easier maintenance for on site personnel and reduce having spare cards on site.

johnjtaylor · Jun 4, 2008

Thankyou Allan. Remote I/O are not applicable to this project though. I just want the wear and tear away from the plc if you know what I mean. I have saved the info for reference. Thankyou again.

Lancie1 · Jun 4, 2008

Thankyou Allan. Remote I/O are not applicable to this project though.

Then you had better actually look at what Allan Barnes suggested. Those A-D modules are NOT "Remote I/O", but instead EIGHT good isolated relays mounted on a single DIN-rail base, with fuses. Certainly you can replace these modules without shutting down the PLC, although probably not each individual relay. At $89, it would not be impractical to replace all 8.

8 pt. 5-30 VDC or 5-240 VAC isolated relay output module, 8 Form A (SPST) relays, 1 point per common, 7.0A/point max., 8 replaceable fuses (T1K-FUSE-3) (Isolation requires use of T1K-16B or T1K-16B-1 terminal base.)

johnjtaylor · Jun 4, 2008

Thankyou Lancie1

We looked at the Automation Direct site and the varied I/O equipment and is not what the customer wants but we have kept it in mind for another project.

This link is for what I was looking for.
http://www.taitcontrols.co.nz/index...CIOWiringSystem

tomalbright · Jun 4, 2008

That's very similar to Weidmuller, which can supply boards and IO wiring to the PLC. I've use those.

Lancie1 · Jun 4, 2008

John,

I am glad that you found what your customer wanted. However it appears that the MOP-16RI relay module from Tait Controls does not have plug-in replaceable relays as YOU originally specified, so you would have to replace all 16 if one goes bad, or become a solder guru.

The Phoenix Contact module relays ARE pluggable and replacable, and come on a 8- or 32-relay module designed to connect to Siemens PLCs. Separate fuse modules are also available from Phoenix.

http://www.phoenixcontact.com/signal-level-matching/31257_30566.htm

Non-Disclaimer: I do not work for any of these companies !

johnjtaylor · Jun 4, 2008

Thanks lancie1

I will take that on board. You are probably right with the phoenix option. There are a lot of similar products around that I have found.

Interposing relay blocks

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