Category: Eaton

The FS32 surge protection device prevents surges and transient

over-voltages conducted along the Trunk or Spurs of fieldbus systems

from damaging the associated electronics such as terminators, spur

blocks and the bus control equipment. Designed to fit Eaton’s latest

MTL fieldbus barrier product to protect spurs the FS32 can also be

used to protect spurs on Megablock wiring hubs. This space saving

design helps to reduce the size of junction boxes and ease installation.

The multi-stage hybrid surge protection network at the heart of

the FS32 uses a combination of solid state electronics and a gas-filled

discharge tube (GDT) to provide surge protection up to 20kA. This

impressive surge protection circuit is design to exhibit exceptionally

low line resistance and has negligible voltage drop to the spurs.

In operation the FS32 does not adversely affect the performance

or operation of the fieldbus or connected equipment, it allows signals

to pass with little attenuation while diverting surge currents safely to

earth (ground) and clamping output voltages to safe levels.

Fully automatic in operation the FS32 devices react immediately

to make sure that the equipment is never exposed to damaging

surges between lines or the lines to earth (ground). Reacting

instantaneously the FS32 redirects surges safely to earth (ground)

and then resets automatically.

The multi-stage hybrid surge protection network at the heart of

the FP32. uses a combination of solid state electronics and a gas-filled

discharge tube (GDT) to provide surge protection up to 20kA. This

impressive surge protection circuit is designed to exhibit exceptionally

low line resistance and adds only a tiny voltage drop to the bus. As a

result, no matter how many FP32 devices are connected to a Trunk or

Spur the system will still be able to support up to 32 transmitters as

specified by IEC 61158-2.

In operation the FP32 device does not adversely affect the

performance or operation of the fieldbus or connected equipment,

it allows signals to pass with very little attenuation while diverting

surge currents safely to earth (ground) and clamping output voltage

to safe levels.

Fully automatic in operation, FP32 devices react immediately

to make sure that equipment is never exposed to damaging

surges between lines or the lines and earth (ground). Reacting

instantaneously, the FP32 redirects surges safely to earth and then

resets automatically.

DIN-rail mounting and a small footprint allow the FP32 to be

conveniently located near terminators and spur blocks, while plug

connectors for Trunk / spur cables and the earth (ground) & shield of

the cable make removing a device or re-patching a simple operation.

A 10 Year ‘No Fuss’ warranty is available, as standard, for the FP32.

so if a correctly connected device should fail for any reason, simply

return it for a free replacement.

The FP32 meets IEC 61158-2:2000 for 31.25kB/s systems such as

Foundation™ fieldbus, PROFIBUS-PA and WorldFIP.

DIN-rail mounting, 20kA surge protection for fieldbus systems

• DIN-rail mounting for easy installation and automatic earthing (grounding)

• 20kA maximum surge current per line

• Plug connectors for quick and easy connection or rewiring

• Meets the requirements of IEC61158-2:2004 for Foundation™ fieldbus

• 10 year product warranty

The FP32 surge protection device prevents surges and transient

over-voltages, conducted along the Trunk or Spurs of fieldbus systems,

from damaging the associated electronics such as terminators, spur

blocks and the bus control equipment. The FP32 is designed to be

used at both ends of the Trunk where a Spur is connected, to safely

divert any surges to earth.

The multi-stage hybrid surge protection network at the heart of

the FP32. uses a combination of solid state electronics and a gas-filled

discharge tube (GDT) to provide surge protection up to 20kA. This

impressive surge protection circuit is designed to exhibit exceptionally

low line resistance and adds only a tiny voltage drop to the bus. As a

result, no matter how many FP32 devices are connected to a Trunk or

Spur the system will still be able to support up to 32 transmitters as

specified by IEC 61158-2.

Device

The address (in decimal and hexadecimal) and signal level of each

device on the network is displayed in turn by pushing the “SELECT”

button. On Foundation fieldbus™ networks, the first device shown

will be the LAS. Measurements greater than 150mV are OK.

Average Noise

Displays the average noise based on the average of the last 100

noise measurements. Noise levels are measured and displayed in 3

frequency bands: frequencies in the fieldbus signalling band (Fieldbus

Frequency, FF), frequencies below the fieldbus signalling band (Low

Frequency, LF) and frequencies above the fieldbus signalling band

(High Frequency, HF). The particular frequency band displayed is

selected by pushing the “SELECT” button. Measurements of less

than 75mV are OK.

Peak Noise

Displays the peak noise recorded since the Monitor was connected.

The value displayed is the highest noise level measured since the last

reset. Peak noise levels are measured and displayed in the same three

frequency bands as average noise. Measurements of less than 75mV

are OK.

Segment Check

When first connected, the FBT-6 gathers data for all of its monitoring

functions. If all the measured data is within an acceptable range, the

Monitor displays “ALL MEASUREMENTS OK”.

Voltage

The DC voltage on the network is shown. Measurements over 9 volts

are OK. The maximum input voltage is 32.0 volts.

Device Count

If there are fieldbus devices active on the network, the Monitor counts

them. If the count has remained the same since the initial network

check was performed, the display shows “OK”.

Note: on Foundation™ fieldbus networks, the Link Active Scheduler

(LAS) is considered a device and, as such, is included in the count.

The FBT-6 is more sensitive to missed communications than most PC

monitoring software. As a result, a device may still show up on PC

monitoring software, even though the FBT-6 has removed the device

from its internal list of active devices. Devices having communication

difficulties may show up on the FBT-6 as repeatedly being added or

dropped. If a device leaves the network, the display shows “–”; if a

new device is added it shows “+”.

Operation

The FBT-6 is connected to the network using the clip-on probes at the

end of the cable. The red probe is connected to the fieldbus + wire,

the black probe to the – wire and the green probe to the shield wire.

The + and – test leads are polarity sensitive and the Monitor will not

operate if they are reversed.

When first connected to a fieldbus, a version number is displayed

for several seconds. The Monitor then performs an Overall Network

Check to give the user a quick indication of network health.

The “FUNCTION” and “SELECT” buttons are used to select from

network parameters that can be examined with the Monitor. When

a function is selected, the data portion of the LCD display is blank

until the Monitor has collected and processed the data. After that,

the measured value is shown. The indication “OK” is shown if the

measured value is within the acceptable range. The indication “BAD”

is shown if the measured value is outside of the acceptable range.

The rotating symbol in the lower right corner of the display indicates

that there is network activity. A horizontal bar (underscore) under the

rotating symbol indicates that a frame was detected, but could not be

decoded. This is not a maintained function, so if a single “bad” frame

is detected, the underscore will only display for a short time. Periodic

“bad” frames will cause the underscore to blink.

Here follows a more detailed explanation of each of the Monitor’s

functions.

Retransmit

The FBT-6 checks for any device not responding to a LAS pass token

and indicates the address (decimal and hexadecimal) of the last device

that failed to respond to the LAS pass token, together with the number

of missed pass tokens since the function was reset. If more than 250

re-transmissions are detected, the display will read “250+”. Pressing

and holding the “SELECT” key for 2 seconds will reset the re-transmit

count for all devices to zero. Pressing the “SELECT” button for less

than 2 seconds displays the number of detected, missed pass tokens

for each device.

Add–Drop

If a new device is added to the network, the Monitor will display

its address and signal level. If a device does not respond to a Pass

Token frame, the device is considered “dropped” by the FBT-6 and

the Monitor will display the address and last known signal level of the

dropped device.

Shield Short

If a short circuit between the + fieldbus wire and the cable shield

is detected, “(+) TO SHIELD SHORT” is displayed. If the short

is between the – wire and the shield, “(–) TO SHIELD SHORT” is

displayed. If a detected shield short goes away the Monitor indicates

an INTERMITTENT SHIELD SHORT to (+) or (-).

Save Report

Saves the data collected by the Monitor as a report. Up to 8 reports

may be saved from multiple segments and/or multiple locations on

one segment.

Transfer Report

Connect the Monitor to a PC USB port and transfer the saved reports

to Excel files on the PC.

Set Report Names

Customize the names of the reports saved in the Monitor to easily

identify the report source

Set OK/BAD Limits

Change the limits at which Monitor measurements transition from OK

to BAD to establish customized plant standards.

Modern fieldbus commissioning procedures require various bus

parameters to be measured and recorded. Key parameters include bus

voltage, signal level for each device and noise level on each segment

or at every device on each segment and recording the results allows

a baseline of the fieldbus physical layer to be established. The FBT-6

collects  this data, and allows up to eight file sets of data to be saved

for uploading to a PC via a USB port. The data is uploaded as a tab

delimited text file and may then be used to create comprehensive

commissioning and operations reports. Considerable savings can be

achieved by reducing commissioning time and verifying the accuracy

of the data on the segment.

Data collected from periodic network verification testing or

during troubleshooting can be simply transferred to a file for easy

comparison to the segment baseline/history measurements. Data can

be displayed as tables and graphs using commonly  available software

such as Microsoft® Excel.

Hand-held for portability, the FBT-6 is powered by the fieldbus

so that no batteries or external power source is required. It includes

colour- coded test leads and an LCD display.

• Fieldbus powered

• Device add & drop indication

• Shield short indication

• Measures low, fieldbus and high frequency average and peak noise

• Measures signal level for all segment devices

• Assesses network health

• Connects to intrinsically safe fieldbus in Zone 1 and Division 1

hazardous areas

• Connects to non-incendive fieldbus in Zone 2 and Division 2

hazardous areas

• Uploads measurement data to a PC via USB port

The Fieldbus diagnostic monitor, FBT-6. is used to examine the

operation of a live Foundation™ fieldbus H1 network without interfering

with its operation. The Monitor is intended for maintenance personnel to

verify network operation or to troubleshoot an errant network.

The FBT-6 checks for retransmissions from each device on the

segment, providing a key performance indicator of the networks health.

Measurements of bus voltage level, device signal level, and peak and

average noise level. It displays the number of devices present on the

segment and indicates when devices are added or removed from the

network. It also detects the presence of a short between either of the

signal wires and the cable shield.

Certifications and compliances

FCS-MBT Model:

• Ex II 1 G EEx ia IIC T4

• Ex II 3 G Ex nA IIC T4 Gc

• Class I, Division 1. Groups A, B, C and D, (Temp Code T4) Ex ia IIC T4

• IS/I/1/ABCD/T4 Ta=70ºC

• I/0/AEx ia IIC T4 Ta=70ºC

• NI/I/2/ABCD/T4 Ta=70ºC

• I / 2 / IIC / T4 Ta=70ºC

F100 Model:

• Ex II 3 G

• Ex nA IIC T4 Gc

• Class I, Division 2. Groups A, B, C and D (Temp Code T4); Ex nA IIC T4

• NI/I/2/ABCD/T4 Ta=70ºC

• I / 2 / IIC / T4 Ta=70ºC

FCS-MBT-XE Model:

• Ex II 2 G Ex eb mb IIC T4 Gb

• Ex eb mb IIC T4 Gb

Environmental ratings (all models):

• Operating Temperature: –45ºC to +70ºC

Design features

Terminators are clearly marked with a large ‘T’ making them easy to identify

in the field Provides some differential and common-mode (cable shield) over

voltage protection

The ground connection on the filedbus terminators are used to shunt any surge

currents that may get on the cable shield to a local ground in the junction box.

Although the normal practice is to ground the cable shield in the control room,

this additional ground connection will not cause ground loops.

In the event of an overvoltage on the cable shield, a gas discharge tube fires

and shunts this unwanted current to ground