Re: [foxboro] L02-1 Equipment questions. Was RCNI, NCNI, FO SWITCH
- From: tom.vandewater@xxxxxxxxxxxxxx
- To: foxboro@xxxxxxxxxxxxx
- Date: Tue, 25 Mar 2003 16:32:34 -0500
A little clarification to Alex's excellent note. Number 5 could read:
5. A single RCNI attaches exactly one Workstation to two seperate Ethernet
switches. The workstation connection - as with the DNBI and DNBT - requires
an Ethernet port and a serial port which is carried from the workstation's
dual ports to the RCNI's single RJ-45 port via a splitter cable, much like
the one used by DNBT's. This is where the installation gets a lot more
complex. The "A" and "B" network port connections from the RCNI are MTRJ
type fiber connections which cannot be connected directly to RJ-45 type
switches such as those recommended by Foxboro. To solve that problem two
MTRJ to RJ-45 media converters are required. The RCNI's also contain the
letterbug that identifies the workstation on the network. To better
visualize the interconnections you can check out B0400DV Rev. A I/A Series
A2(tm) High Performance System Network User's Guide located at:
http://ips.csc.invensys.com/content/Documents/IASeries/b0400/B0400DV_A.pdf
We currently have the equipment, and are installing the software
this afternoon to bring an XP station on line. I can say with certainty
that the physical implementation is a lot more messy and complex than
connecting a DNBT station to the old nodebus. The RCNI converts the RJ-45
connection from the workstation into a MTRJ fiber that then must be
converted back to RJ-45 before going into the switch. I imagine there are
more expensive switches that have direct connect MTRJ ports built into them,
and it might be worth it to buy one since the media converters are ~$550 USD
apiece. The RCNI physical format is a bulky square box that can be mounted
on a DIN rail but can only be powered from a single power source via a
standard power cable. The MTRJ to RJ-45 converters must also be powered in
the same way, as I suppose are the Ethernet switches. Thankfully the
switches can bring in 24 connections from multiple RCNI's and/or NCNI's.
Although I understand and welcome Foxboro's attempt to move from a 5mbs
carrierband and a 10mbs nodebus, to a 1gbs backbone with 100mbs switched
segments, they haven't made it an easy, or inexpensive, thing to do.
Right now we just want to put an XP workstation on an existing
nodebus and it requires the following:
Part # Description
Qty ~$USD ~Total
P0972PF Redundant Control Network Interface (RCNI), DIN 1
$2,346 $ 2,346
P0972KW Fiber Optic Multimode Cable, MT-RJ/MT-RJ, 15 m 2 $
115 $ 230
P0972MD Media Translator 100FX MTRJ Fiber To 10/100TX RJ45 2 $
550 $ 1,100
P0972PP Nodebus Control Network Interface Module (NCNI) 2
$1,900 $ 3,800
P0972MH 24 Port, 10/100BaseTX Ethernet Switch 2
$2,500 $ 5,000
$12,476
It seems like it could be done with the same DNBT that exists today, in
the short term, but I realize that limits it to 10mbs but greatly simplifies
cost and installation in an existing facility with IA enclosures installed.
I also realize that the NCNI's and 24 port switches are a one time cost of
$8,800 and would allow 22 more stations to connect to the bus.
Tom VandeWater
-----Original Message-----
From: Johnson, Alex (Foxboro) [mailto:ajohnson@xxxxxxxxxxx]
Sent: Monday, March 24, 2003 7:35 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] L02-1 Equipment questions. Was RCNI, NCNI, FO SWITCH
Equipment configuration and DNBIs
With regard to how to connect the equipment, this may help:
1. The CP-60 plugs into the standard I/A Series 1x8 enclosure or equivalent.
2. The two NCNIs plug into the same enclosure. Each NCNI attaches to exactly
one port on one switch.
3. The two Ethernet switches are not interlinked.
4. Each switch has a port that connects to the same RCNI, i.e., one RCNI
connect to each switch.
5. A given RCNI attaches exactly one Workstation to an Ethernet switch. The
workstation connection - as with the DNBI - requires an Ethernet port and a
serial port.
So, while it is true that you do not use DNBIs with the new workstations and
Ethernet switches, you do need to use an RCNI which is very, very similar in
function if not form factor.
I'm afraid that I have not investigated the situation with a non-redundant
Control Network in any detail.
Ethernet Switches:
We sell several switch models: some copper and some fiber. Our vendor is
Entrasys (a merger of Wellfleet and Cabletron). We will (or have) certify an
equivalent Cisco switch. We also allow the use of non-Invensys certified
switches.
So, you may use any standard High-Speed Ethernet switch, but please be aware
that we cannot offer the same degree of support for other switches.
Cost of Ethernet Switches:
I really can't comment on cost, but fiber switches from name brand vendors
are not cheap. On at least one occasion in the US, I saw the same switch as
our Fiber Optic Switch offered for 1000 USD more than our US list price. So,
on this topic at least, I believe we are competitive with the market (in the
US anyway).
I hope this helps.
Alex Johnson
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (office)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
For the latest information on ArchestrA, go to
www.invensys.com/Archestra.html.
-----Original Message-----
From: Power Products [mailto:power_products@xxxxxxxxxxx]
Sent: Monday, March 24, 2003 6:06 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] RCNI, NCNI, FO SWITCH
Anybody know anything with NCNIs and RCNIs?
I want to do the following - CP60 connect to nodebus with 2 x NCNI, AW70
connected to nodebus with 1 x RCNI. My question is connecting the NCNI to
RCNI, I will use fiber optic switches, do these switches have to be anything
special? Do I have to get switches from Foxboro? They seem big price!
does somebody know some switch that is good?
Otto Aichinger
Power Production
Austria
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