passive hubs for fieldbus networks Relcom megablock series Megablocks are DIN-rail mounted passive hubs for Foundation fieldbus networks. They connect several field devices to the network trunk cable and provide short circuit protection to the segment. Megablocks minimize hand wiring and allow individual devices to be added to and removed from the segment without disrupting network communication. A green power LED on each unit indicates whether at least 9V dc is present. Megablocks are available in two, four, eight, ten and twelve drop versions. Multiple Megablocks are easily wired to one another to allow larger segments to be constructed. The Megablock Terminator is easily wired to any Megablock to prevent signal reflection on the fieldbus segment. The Megablock Terminator is clearly marked for easy identification by field personnel. Megablocks are also available with an integral terminator making them ideal for a star or chickenfoot topology where several devices are connected at a single field junction box. Each Megablock has two dedicated connections for the fieldbus home run or trunk cable. Trunk connections are easily identified by their black connectors. Separate numbered connections are provided for each spur drop. Connections to the Megablock are made using pluggable screw terminal type connectors. This allows wire terminations to be made to the individual connectors which are then plugged into the Megablock. Devices can then be easily connected and disconnected during commissioning. After commissioning, retaining screws are tightened to secure each connector to the Megablock. SpurGuard is a device-port, short circuit protection technique that minimizes susceptibility to single points of failure, The Megablocks are available with built-in SpurGuard protectors that prevent a short circuit in any of the individual transmitters or spur cable runs from bringing the entire fieldbus segment down. A red LED near each spur connection indicates that a spur is shorted and is in overcurrent mode. Megablock hazardous area approvals permit installation in a variety of configurations in Zone or and Division or. Within Zone or Division Megablocks may be installed as part of non-sparking (non-arcing) or energy-limited (non-incendive) circuits. Additionally, SpurGuard versions have energy-limited spur connections even if the trunk is classified as 'non-sparking', when fed for example from an Fxx or FPS-I fieldbus power supply. Within Zone and Division Megablocks are designed for installation in intrinsically safe applications, and are compatible with or Entity-approved field instruments. An energy-limited or intrinsically safe fieldbus allows live connection/ disconnection of the fieldbus without the need for a gas clearance certificate, which assists in commissioning, maintenance and system expansions. Alternatively, for applications using flameproof certified devices, the Megablocks are designed to meet the requirements for increased safety for installation in an Ex e junction box in Zone. To select the Megablock for your application see the Ordering Information section of this document.
mtl - relcom Megablocks Installation Megablocks can be mounted vertically or horizontally using 5 mm DIN rail within a suitable enclosure, such as a field junction box. Megablocks are removed from the DIN rail using a flat blade screwdriver to release the mounting platform. Use of DIN rail end stops is recommended to prevent sliding in vertical installations. Four, eight and ten port Megablocks have labeling areas so that segments can be easily identified according to plant standards. MTL have a wide range of standard junction box designs for use with Megablocks. See the data sheet for the range of Process JBs. Shown above is an example of a common Fieldbus segment topology. Eight field devices are connected to an eight-drop Megablock, which is mounted in a field junction box. One trunk connector on the Megablock is wired to a Megablock Terminator and the other to the segment trunk cable that leads to the control room or marshalling panel where the power supply and second terminator are located. The Megablock Terminator in the field has a normally open connection to earth ground that closes when surge conditions are detected. Grounding To prevent ground loops, a fieldbus segment should only be grounded at one point. This is usually done by grounding the cable shield at the control room end of the segment. If a permanent segment ground connection in the field is desired, this can be achieved by wiring the shield terminal on one of the Megablock trunk connectors to a suitable earth ground instead of wiring it to the shield terminal on the Megablock Terminator. Fieldbus Connection System (FCS) wiring blocks are protected by U.S. Patents 6,66,, 6,69,99 and 6,59,5. Specifications Mounting Requirements: 5mm DIN rail Wire Capacity: 0. to.5mm Case material: Lexan Polycarbonate Temperature Range: 5º to +0ºC Voltage Required to activate LED: 9.V dc minimum FCS-MBx Megablock Consumption:.mA maximum Maximum Current Delivered to Spur: Not Limited Trunk to Spur Voltage Drop: 0V FCS-MBx-SG, F & F5 Megablock with SpurGuard Consumption: No SpurGuards tripped:.5ma per SpurGuard tripped: 60mA Maximum Current Delivered to Spur: 5.mA ±.ma Trunk to Spur Voltage Drop (SpurGuard not tripped): DC Impedance: Ω Typical: 0.V dc (ma device current draw) Trunk to Trunk Voltage Drop: 0V F - F Intrinsically Safe Megablock with SpurGuard Consumption: with no SpurGuards tripped: ma (F,F5), ma (F5,F59).5mA (F) per SpurGuard tripped: ma Maximum Current Delivered to Spur: 0.9mA ±.0mA Trunk to Spur Voltage Drop (SpurGuard not tripped): Typical: 0.V dc (ma device current draw) DC Impedance: 5Ω Trunk to Trunk Voltage Drop: 0V F5-XE - F-XE Increased Safety (Ex em) Megablock with SpurGuard Consumption: with no SpurGuards tripped:.9ma per SpurGuard tripped: ma Maximum Current Delivered to Spur: 0.9mA ±.0mA Trunk to Spur Voltage Drop SpurGuard not tripped: 0.V maximum Trunk to Trunk Voltage Drop: 0V FCS-MBT & F00 Megablock Terminator Operating Temperature Range: 5º to +0ºC Common Mode Voltage Limit: 9V Transient Mode Voltage Limit: 5V Physical Network IEC 65- Foundation fieldbus H Profibus PA
Ordering Information No SpurGuard General Purpose Zone/Division and Intrinsically Safe With SpurGuard short circuit protection General Purpose and Zone/Division Zone/Division Intrinsically Safe Zone Ex em Megablocks way FCS-MB FCS-MB-SG F - way FCS-MB FCS-MB-SG F5 F5-XE way with internal Terminator - FCS-MB-SG-T F F-XE way FCS-MB FCS-MB-SG F5 F5-XE way with internal Terminator - FCS-MB-SG-T F5 F5-XE 0 way - FCS-MB0-SG - - 0 way with internal Terminator FCS-MB0-T FCS-MB0-SG-T F59 F59-XE 0 way with switched Terminator - F F6 - way - FCS-MB-SG - - way with internal terminator - FCS-MB-SG-T F F-XE way with switched Terminator - F5 - - Terminators F00* F00 FCS-MBT FCS-MBT-XE FBT-IS FBT-IS FBT-IS * Use FCS-MBT for intrinsically safe applications See Terminators datasheet for full details ACCESSORIES Description Heavy Duty DIN rail end stop 5mm DIN Rail, metre lengthw Process JB stainless steel, painted Process JB carbon loaded GRP Process JB stainless steel Part Number ETL000 THR000 FCS-5XX FCS-5XX FCS-95XX See Process JB data sheets for further details
CASE DIMENSIONS -way MEGABLOCK -way MEGABLOCK.".66" 6.6 mm FCS-MB-SG FCS-MB-SG (50)5-560Made in USA Spur in Mode.6" 5.9 mm (50) 5-560 Made in USA.6" 0. mm Spur in Mode.9".9" -way MEGABLOCK 0-way MEGABLOCK.66" 6.6 mm." FCS-MB-SG FCS-MB0-SG-T 5 (50) 5-560 Made in USA 6 Spur in Mode 5.6". mm T (50) 5-560 Made in USA 5 6 9 0 6.6" 56.5 mm.9" Spur in Mode.9" Note: Different Megablock versions have minor variations in labelling.
CASE DIMENSIONS (cont) -way MEGABLOCKS FCS-MB-SG-T F5, F, F-XE."." FCS-MB-SG-T F Trunk 5 6 Relcom www.mtl-fieldbus.com T 9 0.6".9 mm 5 6 Relcom www.mtl-fieldbus.com T 9 0.6".9 mm Spur in Mode Spur in Mode.9".9"
APPROVALS - For full certification information visit www.mtl-inst.com/support/certificates/ MODELS - F00, FCS-MBT, FCS-MB, FCS-MB, FCS-MB, FCS-MB0-T Country Europe USA Canada Canada Europe Authority ATEX (Category ) FM CSA CSA LCIE Standard EN 6009-0 : 006 EN 6009-5 : 005 Approved for E II G Ex na[l] IIC T 6 C. No. - M9 CAN/CSA - E9-5-95 T Ex na IIC T C. No. 5-9 CAN/CSA - E9--95 Ex ia IIC T EN6009-0 : 006* EN6009- : 00* E II G Ex ia IIC T Certificate no. RELC0ATEX00X 069 9909 9909 LCIE0ATEX6X Cable (Spur) Energy limited Ui=V Ii=.5A Non-arcing Non-arcing Vmax, Ui=V Imax, Ii=50mA Pi=.W Vmax, Ui=.5V Imax, Ii=0mA Pi=5.W Vmax, Ui=V Imax, Ii=50mA Pi=.W Note Non-arcing Non-arcing As trunk As trunk Uo = V Io = 50mA Co = 6nF Lo = 56µH Po =.W Note Vmax, Ui=.5V Imax, Ii=0mA Pi=5.W Uo =.5V Io = 0mA Co = 6nF Lo = 6µH Po = 5.W Note * the original LCIE Certificate used EN 500:99 + Amendments & and EN 5000:99. We have determined that there are no technical differences (affecting the products) between these standards and the currently harmonized EN standards listed above. Note : Spur is Energy-limited only if trunk is installed as Energy-limited, in which case spur field wiring are as source of supply to trunk, and limited to V and.5a max. Note : The figures quoted apply to IIC gas group. See certificate for parameter relating to groups IIB and IIA MODEls - F, F5, FCS-MB-SG-[T], FCS-MB-SG-[T], FCS-MB-SG-[T], FCS-MB0-SG-[T], FCS-MB-SG-[T] Country Europe USA USA Canada Canada Authority ATEX (Category ) FM FM CSA CSA Standard EN 6009-0 : 006 EN 6009-5 : 005 Approved for E II G Ex na[l] IIC T 6 6 C. No. - M9 CAN/CSA - E9-5-95 IEC 6009-5 T T Ex na [nl] IIC T C. No. - M9 CAN/CSA - E9-5-95 Ex na IIC T Certificate no. RELC0ATEX00X 069 05 095 9909 Cable (Spur) Energy limited Ui=V Ii=.5A Energy limited Uo=V Io=60mA Co=0nF Lo=.6mH Note Non-arcing Non-arcing Non-arcing Non-arcing Non-arcing Non-incendive Voc=V Isc=60mA Ca=0nF La=.6mH Non-incendive Voc=V Isc=60mA Ca=0nF La=.6mH Note : Trunk may be installed as Energy-limited or Non-sparking circuit; Spur is Energy-limited in either case. Non-arcing
APPROVALS - For full certification information visit www.mtl-inst.com/support/certificates/ MODEls - F, F5, F, F5, F5, F59, F6, F Country Europe USA USA & Canada International Authority KEMA FM CSA IECEx Standard EN 6009-0 : 006* EN 6009- : 00* Approved for E II G Ex ia IIC T 60 C. No. 0 - M9CAN/ C. No. 5-9 CAN/CSA - E9-0-95 CAN/CSA - E9--95 FM600 FM60 IS/I//ABCD/T Ta=0ºC I/0/AEx ia IIC T Ta=0ºC Ex ia IIC T IEC6009-0 : 000 IEC6009- : 999 Ex ia IIC T Certificate no. KEMA0ATEX555X 005 IECExCSA06.000X Ui V Ii 50mA Pi.W Ui.5V Ii 0mA Pi 5.W Vmax = V Imax = 50mA Pi =.W Vmax =.5V lmax = 0mA Pi = 5.W Vmax, Ui = V Imax, Ii = 50mA Pi =.W Vmax, Ui =.5V lmax, Ii = 0mA Pi = 5.W Ui = V Imax, Ii = 50mA Pi =.W * the original KEMA Certificate used EN 500:99 and EN 5000:00. We have determined that there are no technical differences (affecting the products) between these standards and the currently harmonized EN standards listed above. Model F currently has only KEMA approval to the standards indicated. Ui =.5V lmax, Ii = 0mA Pi = 5.W MODEls - F5-XE, F-XE, F5-XE, F5-XE, F59-XE, F-XE, FCS-MBT-XE Country Authority Europe KEMA Standard EN 6009-0 : 00 EN 6009- : 00 EN 6009- : 00 Approved for Certificate no. Trunk wiring E II G Ex em IIC T KEMA05ATEX006 Rated voltage 0V DC Rated current.5a MODEL - FBT-IS Country Europe US Authority BASEEFA FM Standard Approved for EN500(99) +A & A EN5000 (00) II G EEx ia IIC T (-0ºC Ta +0ºC) 60 Entity IS/I//ABCD/T Ta=0ºC I/0/AEx ia IIC T Ta=0ºC Certificate no. Baseefa 0ATEX00 06 Ui = 0V Ii = 50mA Pi =.W Ui =.5V Ii = 0mA Pi = 5.W Vmax = 0V Imax = 50mA Pi =.W Vmax =.5V lmax = 0mA Pi = 5.W