Johnson Controls MS-FIT100-0 Manual de usuario
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MS-FIT100-0 Field Inspection Tool
User Guide
Table of contents
1. Introduction
1. Accessories
2. Physical Features
2. General Use and Information
1. FIT User Guidelines
2. FIT Connection to Bus
3. Modes of Operation
1. Monitor Mode
2. Scan Bus Mode
3. 1-ON-1 Mode
4. Battery Usage
3. Getting Prepared to use the FIT
4. FIT Menu
1. FIT Power On Menu
2. FIT Issues Menu
3. 1-ON-1 Menu
4. Monitor Menu
5. Scan Bus Menu
6. Voltage Menu
1. Idle Bus Menu
2. Bit Voltage Menu
3. Meter Menu
5. System Menu
1. Report Menu
1. General Bus Information
2. Device Information
3. Issue Information
1. Example Report in Excel
2. Report Submenu
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6. Appendix A
1. MS/TP Communication Basics and the FIT
2. Voltage Levels
1. Communication Voltage Levels
2. Idle Bus Voltage Levels
3. Proper EOL Termination
4. FIT Connection, EOL, and Shield Grounding Scenarios
3. 1-ON-1 Communication Voltage Levels
1. Network Communication Voltage Levels
2. Voltage Table
4. Tips for Correcting Bus Installation Problems
5. Quick Start Guide
6. FIT Display Table
7. Appendix B: FIT Firmware Update Instructions
1. Programming the FIT
8. Single point of contact
Introduction
The Field Inspection Tool (FIT) is a portable handheld device with a user interface that
is used to test and troubleshoot the BACnet® protocol MS/TP RS-485
communications bus that connects supervisory controllers and field controllers to
field point interfaces.
The FIT can be used to check out the wiring of the MS/TP RS-485 bus as well as verify
proper communications of supervisory controllers and field controllers connected to
the bus. The FIT can be used on both the Field Controller Bus (FCB) and Sensor
Actuator Bus (SAB).
The FIT can perform the following functions on the FC/SA Bus:
Measure bus bias voltage levels
Communicate with controllers and provide:
- Number of Devices Online
- Device addresses
- Model Name
- Application Name
- Firmware Revision
- Status of End of Line (EOL) termination switch
- Measure RS-485 communication voltage levels from controller
- Other controller attributes
Monitor and report communication errors
For more information on MS/TP basics see, MS/TP Communication Basics and the FIT.
Accessories
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The following accessories for the FIT can be ordered separately:
Table 1. Products and Accessories
Code Number Description
MS-FITCASE-0 FIT carrying case; includes one soft-sided carrying case
FX-BTCVTCBL-700 FIT cable replacement; includes one 5 ft. (1.5m) retractable
cable
Physical Features
The FIT is a portable handheld device. It is powered by two AA Alkaline batteries
through the on/off power switch. The LCD display is a two-line by eight-character
display with backlight, and the keypad consists of four keys. A Four-Pin removable
terminal block, and the RJ-12 connector cable provide the interface to the MS/TP
bus. The FIT also has a Micro-USB port, which is used to update the firmware and
extract report data. See Figure 1.
Figure 1. FIT Physical Features
All the keys on the FIT have a repeat function in which the key action is
repeated when the key is held down for more than one second. For example, if you
hold down the Down Arrow Key, the cursor field moves down one selection each
half second. The repeat rate is the same for all the keys.
General Use and Information
FIT User Guidelines
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Observe the following guidelines when using the FIT:
Do not use the RJ-12 cable to support the weight of the FIT. The FIT comes with
a magnetic strap for hanging from ductwork or other metal surfaces.
Keep the FIT in the protective shell with which it ships.
The FIT has not been designed for prolonged outdoor use. Leaving it in
outdoor environments may result in damage.
Keep FIT power off when not in use. Test the FIT batteries and replace them
when necessary. Prolonged battery use may cause battery leakage to occur.
To view training videos on using the FIT tool, click here to visit the uLearn website.
FIT Connection to Bus
The FIT is provided with a RJ-12 connector cable that is connected to the FC/SA 6 pin
RJ-12 jack found on most Johnson Controls® controllers. The FIT also has a Four-Pin
removable terminal block that is used to wire the FIT to the FC/SA bus. When the FIT
is connected to the FC bus, it can only see the devices directly connected on the FC
bus, but not the SA bus. Conversely, when the FIT is connected to the SA bus, it can
only see the devices on the SA bus, but not the FC bus.
It is best to connect the FIT tool to the bus and then power it up. Assuming
communication is occurring, the FIT first has to determine the baud rate of the
communication signal before it can read the communication messages. If the FIT is
powered before it is connected to the bus, the mechanical connection causes the bus
voltage to be unstable for a time, which can cause the FIT to mistake the proper baud
rate. The occurrence of this issue is unlikely, but it can occur. When no
communication is occurring (the bus is in a fixed idle state), the FIT initially displays
Offline.
Modes of Operation
The FIT has three main modes of operation to help troubleshoot MS/TP buses:
Monitor mode, Scan Bus mode, and 1-ON-1 mode.
Monitor Mode
The Monitor mode allows the FIT to see devices that are connected to and
communicating on the bus. If the health bars appear on the display when the FIT is
connected to the bus, then communications are occurring. Enter the Monitor mode
by pressing the Enter Key or by scrolling to the Monitor menu. The Monitor mode
only listens to the communications occurring on the bus, does not interact with the
communications, and therefore does not affect the operation of the bus. The Monitor
mode is recommended to use first if communications are already occurring on the
bus. For more information, see the FIT Menu and Monitor Menu .
Scan Bus Mode
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The Scan Bus mode interacts with the communications on the bus because it reads
the attributes of the controllers communicating on the bus. If no communications are
occurring on the bus, the Scan Bus mode starts communications to all controllers on
the bus. The Scan Bus mode is helpful when there is not an active supervisory
controller connected to the bus since it is the supervisory controller that usually starts
the communications due to fixed address. The Scan Bus mode is used to read the
EOL termination attribute of the controller. The EOL termination attribute is limited to
Johnson Controls manufactured products that have a built-in EOL switch. The
location of other EOL devices, such as the MS-BACEOL-0 or jumpers, are not
detected. See Proper EOL Termination , FIT Menu and Scan Bus Menu for more
information.
1-ON-1 Mode
The 1-ON-1 mode is used to test a single controller that is disconnected from the
network with the FIT connected to the FC Bus. In the 1-ON-1 mode, the FIT supplies
the proper EOL termination to test the communications of the device. In the 1-ON-1
mode, all of the attributes of the controller can also be read, such as Model name,
Firmware revision, EOL termination switch, and other attributes. The 1-ON-1 mode is
used to verify the operation of any single controller that does not communicate on
the bus. It is used to help determine if a Johnson Controls manufactured controller is
defective.
The FIT only validates MS/TP controllers and devices that are hardwired to a FC/SA
Bus. Wireless devices are not currently supported other than the 1-ON-1 mode at the
controller’s SAB port.
For more information, see FIT Menu and 1-ON-1 Menu .
Battery Usage
The FIT is operated from two AA Alkaline battery cells. When operated with the LCD
backlight turned off, the FIT can operate for approximately 50 continuous hours.
Continuous operation with the LCD backlight on is approximately 20 hours.
There is a battery test under the Systems menu to determine when to replace the
batteries. To replace the batteries, turn the power switch off. Remove the two AA
battery cells and replace with two AA Alkaline cells, while noting the proper polarity
of the battery holder.
Getting Prepared to use the FIT
About this task
The FIT tool is intended to be used with the Branch Engineered Installation Control
Drawings, Riser Diagrams, and Room Schedules. The tool, does not only validate the
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cable and terminations are correct but ensures the anticipated number of controllers
match the quantity found. Validate controller addresses and correct any duplicates.
Before using the FIT, the user needs to make sure the bus installation to be tested (FC
or SA) is complete and ready to be validated. This includes the following:
1. Bus cable is installed, and terminated at every controller.
2. MS/TP bus shield is continuous end to end for each bus segment with only one
hard ground per bus segment.
RJ-12 connections, typically for sensors, do not require use of
shielded cable due to distance limitations.
3. EOLs are present at the end of each bus segment.
Not applicable for SAB RJ-12 connections.
4. Power is available for every controller on the bus to be validated.
If no power is available to the controller when the MS/TP bus needs to be tested,
providing temporary power to the controllers to validate bus wiring is an option. If
temporary power to all controllers is not practical, there are two other options:
1. Use two FITs connected at each end of a bus or bus segment if unpowered
repeaters are present. Each FIT would be required to have different addresses
and EOL set if applicable. See System Menu section for more information on
setting addresses and EOL attributes.
2. Use one FIT connected at the end of a bus and temporary power applied to the
last controller on that bus or bus segment if unpowered repeaters are present.
If the FIT is at the end of a bus segment, its EOL attribute should be set to ON.
Testing in these two methods does not ensure addresses are correctly set or detect
every potential controller MS/TP wiring mistake but does validate continuous bus
wiring and end-to-end continuity.
For every installation, it is the installer’s responsibility to use the FIT to confirm:
Procedure
1. A Bus Health reading of four bars or greater for all FC Bus installations.
2. All device addresses are reporting for each FC Bus installation and each address
is correct.
3. A Bus Health reading of four bars or greater on all SA Bus installations.
For most MS/TP installations, a properly installed bus achieves a Bus
Health of eight bars. Anything less than eight bars is normally an indication of
an installation error but could be caused by extremely long cable distances or a
heavily loaded bus.
Note:
Note:
Note:
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4. For each SA Bus installation, all device addresses are reporting.
Figure 1. FIT Menu Screens
The FIT is designed to work with MS/TP hard wired controllers only and ignores
wireless connected controllers.
FIT Menu
Figure 1. FIT Menu
FIT Power On Menu
Figure 1. FIT Power Menu
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In this initial power on mode, the FIT is just monitoring FC/SA bus communications
and is not actively participating in communications.
The Bus Health consists of eight bars indicating the health of the FC/SA
communication bus. The higher number of bars the higher the health. When the FIT
is first connected to the bus, the Bus Health starts out at eight bars and then the
communications are monitored for errors. The number of bars is reduced if
communication errors are occurring. Communication errors can occur for various
reasons such as noise from electrical sources, long wire lengths, heavily loaded buses,
loose terminations, duplicate addresses, or improperly wired buses. Some
communication errors are tolerated as long as they do not cause issues such as
controllers going online and offline, erratic communications, or poor system control.
A Bus Health reading of eight bars is obviously desired, but it is considered
acceptable to have a Bus Health reading of four bars or more. Bus Health is basically
calculated by counting communication errors over time. A Bus Health of four bars
equates to two communication errors per minute, which is tolerable for FC/SA
communications.
When the FIT powers on, it may display No MSTP. This can mean the FIT is seeing
bus traffic, but a token is not passing between addresses. This occurs when one or
multiple FEC/VMA controllers on the bus have an address switch position eight
(normally labeled 128) in the ON position. This switch is not to be used on a hard-
wired Johnson Controls MS/TP Bus. It is reserved for Wireless bus installations. If you
see this condition, validate that all FEC/VMA MS/TP hard-wired controllers have the
128 switch in the OFF position.
No MSTP can also be displayed if an MS/TP bus which is active has installation errors
significant enough for the FIT to fail determining a baud rate. If this condition is
experienced, use the FIT’s Voltage > IdleBus to validate proper voltages (see Voltage
Levels for more information). In addition, the FIT’s baud rate could be adjusted from
the default autobaud in the System Menu to the specific baud rate of the bus that is
being tested (see System Menu for more information).
FIT Issues Menu
The Issues menu reports on any bus errors or other issues that are occurring on the
FC/SA bus the FIT is monitoring. The FIT is constantly monitoring the FC/SA bus for
errors. Only the last five communication errors are reported in the issue menu and
the FIT continues to update the number of issues during an MS/TP validation session.
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If the FIT is turned OFF, issue count and history are not maintained. For a list of
common issues and corrective actions, see Figure 6. No MSTP displays when the FIT
is connected to a Bus with a very poor Health Index.
Figure 1. FIT Issues Menu
To display the rest of the issues, depress the Down Arrow to scroll through
the issues. On any issue being displayed, depressing the Enter Key provides more
information specific to that issue. See Table 2 for a list of possible common issues.
See the FIT Display Table for more information of terminology used and acronyms in
the display examples.
Figure 2. Issue History
Table 1. List of Common Issues and Corrective Action
Display Description Potential Corrective Action
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Display Description Potential Corrective Action
BadFrame
system time
Bad MS/TP frame. Invalid
MS/TP header CRC or data
CRC. Bad frames are
typically caused by wiring
issues, duplicate addresses,
wrong baud rates and/or
noise.
1.
Check Idle Bus Voltage.
2.
Confirm the correct FIT baud
rate is being used.
3.
If repeaters are present, check
their baud rate.
4.
Check for duplicate addresses.
5.
Break the bus segments down
into smaller segments to
isolate, find and correct the
wiring problem.
Online Device came online. This is
listed as an issue because a
device came online after
the last bus loop.
Unless the controller was purposely
removed from the bus or had its
power turned off, determine why it
came online late.
This could be caused by a problem
with termination of 24 VAC power or
bus cables.
Go to the controller in question and
make sure all 24 VAC power and bus
cables are securely terminated.
Otros manuales para MS-FIT100-0
1
Este manual sirve para los siguientes modelos
1
Tabla de contenidos
Otros manuales de Herramientas de Johnson Controls
