Toshiba MDB-100 User Manual
“MICRO” ADJUSTABLE SPEED DRIVE INTERFACE
MDB-100
MODBUS RTU / ASCII COMMUNICATIONS INTERFACE
FOR THE TOSHIBA VF-S7 SERIES
ADJUSTABLE SPEED DRIVE
August, 1999
ICC #10207-000
Introduction
Thank you for purchasing the ICC MDB-100 Modbus RTU / ASCII Communications
Interface for t he Toshiba VF-S7 Series Micro Adjustable Speed Drive. Before using
the MDB-100 interface, please familiar ize yourself with the pr oduct and be sur e to
thoroughly read the instructions and precautions contained in this manual. In
addition, please make sure that this inst r uction manual is delivered to the end user of
the drive units with which the MDB-100 interface is connected, and keep this
instruction manual in a safe place f or future reference or dr ive/int er face inspection.
This instruction manual describes the device specificat ions, wiring methods,
maintenance procedures, supported functions and usage methods for the MDB-100
Modbus RTU / ASCII communications interface.
In conjunction with this manual, the following manuals ar e supplied by Toshiba, and
are essential both for ensuring a safe, reliable system installation as well as for
realizing the full communication and cont r ol potential of the MDB-100 interface:
• Toshiba TOSVERT VF-S7 Series Instruction Manual
• Toshiba VF-S7 Industrial Invert er Serial Communications Option Manual
If you do not have copies of these documents available, please contact Toshiba or
your local Toshiba distributor to obtain them.
M
ODBUS IS A REGISTERED TRADEMARK OF
CHNEIDER AUTOMATION
AEG S
1
Usage Precautions
Operating Environment
•
Please use the MDB-100 only when the ambient temperature of the environment into
which the MDB-100 is installed is within the following specified temperature limits:
Operation
Storage
•
Avoid installation locations that may be subjected to large shocks or vibrations.
•
Avoid installation locations that may be subjected to rapid changes in temperature or
humidity.
: -10 ∼ +40°C (+14 ∼ +104°F)
: -25 ∼ +65°C (-13 ∼ +149°F)
Installation
•
Do not touch charged parts of the drive such as the terminal block while the drive’s
CHARGE lamp is lit. A charge will still be present in the drive’s internal electrolytic
capacitors, and therefore touching these areas may result in an electrical shock.
Always turn all drive input power supplies OFF, and wait at least 5 minutes after the
CHARGE lamp has gone out before connecting communication cables or motor wiring.
•
Route all communication cables separate from the inverter input/output power wiring.
•
To avoid the possibility of electric shock due to leakage currents, always ground the
inverter unit’s E/GND terminal and the motor. To avoid misoperation, do not connect
the MDB-100’s SHIELD terminal to either of the above-mentioned grounds or any other
power ground.
•
When making connections between the MDB-100 and S7 drives, do not use cables
that exceed 5 meters in length.
•
For further drive-specific precaution, safety and installation information, please refer to
the appropriate Toshiba documentation supplied with your S7 drive.
Other Precautions
•
The drive’s EEPROM has a life span of 10,000 write cycles. Do not write to the same
holding register (other than registers 7A00 ∼ 7A02 and FA00 ∼ FA02 or write-only coils)
more than 10,000 times.
•
The MDB-100’s EEPROM has a life span of 100,000 write cycles. Do not write to the
same MDB-100 configuration register more than 100,000 times.
•
Do not touch or insert a rod or any other item into the MDB-100’s case while power is
applied, as this may lead to electrical shock or device damage.
•
Commission the disposal of the MDB-100 to a specialist.
•
Do not assign the same network address to more than one MDB-100 station in the
same network. For a detailed explanation of station addressing, refer to section 8.
•
When the MDB-100 is configured to receive its Modbus RTU / ASCII station address
from the drive on Channel A, be sure to reset the MDB-100 if the inverter number
parameter on the drive on Channel A is changed. Refer to section 8 for more
information.
•
Because the MDB-100 derives its control power from the drive connected to Channel
A, removing power from that drive will also cause the MDB-100 to lose power, even if
power is still applied to the drive connected to channel B.
•
When only 1 drive is connected to the MDB-100, it must be connected to Channel A.
••••
Wiring
2
TABLE OF CONTENTS
1.
2.
3.
4.
5.
6.
6.1 Storage ..........................................................................................................10
6.2 Warranty ........................................................................................................10
7.
8.
9.
9.1 Supported Modbus Commands ......................................................................15
9.2 Programmable Pointer Register Function .......................................................15
9.3 Loss of Communications Timer Function.......................................................16
9.4 Response Delay Timer Function .................................................................... 17
Interface Package Diagram..................................................................4
Feature Summary.................................................................................. 5
Installing The MDB-100 ........................................................................7
Equipment Specifications....................................................................9
Maintenance And Inspection ...............................................................9
Storage And Warranty........................................................................10
Network Characteristics Configuration ............................................11
Modbus Station Address Selection...................................................13
Modicon Programming.......................................................................15
10. Modbus Programming Interface........................................................19
10.1
10.2
10.3
10.4
Overview.....................................................................................................19
Holding Registers .......................................................................................24
Write-Only Coils..........................................................................................31
Read-Only Coils..........................................................................................32
11. Notes....................................................................................................33
3
)
1. Interface Package Diagram
Network connector
(TB1)
Case mounting hole
Switch SW2
(local address)
Switch SW1
(network
characteristics
Drive “B” connector Drive “A” Connector
Case mounting hole
Note that the above diagram shows the MDB-100 with its cover removed. However,
it is only necessary to remove the cover in order to initially configure the MDB-100.
Once configured, the cover should be reinst alled to prevent damage and dust
accumulation.
4
2. Feature Summary
The MDB-100 interface provides a wide array of network data access and drive
control features. Combined with the flexible data access methods and universal
acceptance of the Modbus network, this allows powerful networked contr ol and
monitoring systems to be designed. Som e of the main features provided by the
MDB-100 which allow for this control and configurability are briefly described here:
Protocol
Modbus RTU and ASCII as specified in AEG Schneider Automat ion specification
“Modicon Modbus Protocol Reference Guide PI-MBUS-300 Rev. J”.
Implementation
Modbus network is optically isolated RS485 half-duplex 2-wire + shield physical layer,
allowing connection of up to 32 units (masters and slave MDB-100 units) to a single
bus trunk.
Network Baud Rates
Supports all Modbus RTU/ASCII baud rates f rom 300 baud to 38.4kbaud.
Drive Connections
The MDB-100 provides support for simultaneous connection of 2 VF-S7 drives. Both
drives share a common Modbus station address. By supporting 2 drives per
interface, the maximum number of drives that can be connected to 1 Modbus
network segment without requiring r epeat ers increases from 31 (31 drives + 1
master) to 62 (31 MDB-100 units + 1 master).
Power Supply
Self-contained. Powered directly fr om the drive connected to the Channel A
communications port. No external power supply devices or connections are required.
Isolation
The MDB-100 has 3 separate isolated circuitry sections. Each drive is f ully optically
isolated from each other, and bot h dr ives are opt ically isolated from the Modbus
network. By using optically isolated connections to the drives and the Modbus
network, noise immunity is greatly impr oved and g r ounding differential pr oblem s
become a thing of the past.
Drive AutoScan Algorithm
Connections to the drives are automatically established and continuously monitored.
No drive configuration needs to be performed to connect the MDB-100 and
communicate via the Modbus RTU or ASCII network. Just plug it in – it’s that simple.
5
Programmable Pointer Registers
32 programmable pointer reg ist ers are provided for user definition. By using these
registers, freq uently-accessed drive parameters that may be scattered throug hout the
register map can be grouped tog ether and accessed with a single holding register
read or write command.
Response Delay Function
A programmable network response delay f unction is available which forces the MDB100 to wait a certain minimum time before generating network responses to Modbus
commands. This function is useful when equipment such as radio modems (which
require a finite time t o switch from receive to transmit mode) are used as Modbus
network bridges.
Network Watchdog
A network watchdog function is available to detect if communication with the master
controller has been interrupted. If an interruption is detected, several different drive
actions can be programmed to ensure that t he pr ocess under control can be safely
and automatically driven to a desired state.
Modbus Network Connector
The network interface is a 3- position pluggable terminal block with the following
signals provided:
Pin Number Function
1 Modbus network RS485 “A” terminal
2 Modbus network RS485 “B” terminal
3 Network shield connection point
No network termination is provided on the MDB-100. Be sure to install proper RS485
network termination on the MDB-100 units that exist on the extreme endpoints of the
network bus. This can be accomplished by placing a 121Ω (±5%) , 1/2W resist or
across the A and B network terminals of t hose 2 unit s .
Drive Network Connectors
Uses standard RJ-45 style 8-pin modular connectors. Any standard category-5
ethernet cable (found in most electronics and office-supply stores) 5 meter s or less in
length can be used to connect the MDB-100 to the drives.
Supported Commands
The MDB-100 presents and receives drive data via Modbus commands 01 (read coil
status), 03 (read holding reg ist er s) , 05 (force single coil), 06 (pr eset single register)
and 16 (preset multiple registers) .
6
3. Installing The MDB-100
The MDB-100 connects to each drive via the drive’s communication port, located on
the right-hand side of the dr ive enclosure under a sm all snap- on cover. Although no
drive parameters need to be configur ed in order to use the MDB-100, it is
advantageous to check that the drive’s communicat ion dat a r at e is set to its
maximum speed. Because the MDB-100 will communicate to each drive only at the
drive’s configured data rate, t his will provide the fastest response time for dr ive-t oModbus network data transfers. For information on checking the drive’s
communication data rate, refer to the appropriate manual supplied with your drive.
Note that each drive’s communication data rate settings are independent of the
Modbus network data rate, which is configured solely by the Modbus network
characteristics switch (refer to sect ion 7) . Also not e that the data communication
parameters of each drive are handled independently; the dr ive connected t o Channel
A may simultaneously communicate to the MDB-100 at completely different baud
rates, parity settings, etc. than the drive connected to Channel B.
Installation of the MDB-100 Modbus RTU / ASCII inter face should only be performed
by a qualified technician familiar with the m aintenance and operation of the
connected drives. To install the MDB-100, complete the following steps:
1.
connected have been turned OFF and are locked and tagg ed out .
2.
capacitors to discharge before pr oceeding to the next step.
internal parts with power applied to the drive, or for at least 5 minut es af t er
power to the drive has been removed. A hazard exists temporarily for
electrical shock even if the source power has been removed.
CHARGE LED has gone out before continuing the installation process.
3. Attach the MDB-100 to a sturdy, unmovable object (such as a wall) via the 2 case
mounting holes located on the tabs at the t op and bottom of the enclosure.
4. Remove the drive’s communication port cover, located on the rig ht - hand side of
the drive (as viewed when facing the drive), by pressing against the side of the
cover while sliding it toward the front of the drive. Do not discard this cover, as it
should be reinstalled if the MDB-100 unit is ever disconnected fr om t he drive.
5. Connect the drive’s communication port to Channel A of the MDB-100 with the
communication cable (communication cable is not included with the MDB-100 kit).
When choosing cables for this connection, standard 24 AWG category-5 (CAT 5)
unshielded twisted-pair (UTP) 8-conductor cables f ound in ethernet networks in
most office environments can be used. The maximum allowable length for these
cables is 5 meters. Although there are many varieties and styles of CAT-5 UTP
cables available, ICC strongly recommends using only high- quality cables from
reputable manufacturers to guarantee optimal noise immunity and cable
longevity. Ensure that each end of the cable is fully seated into the modular
connector, and route the cable such that it is locat ed well away from any drive
input power or motor wiring. Also take care to route the cable away from any
sharp edges or positions where it may be pinched.
CAUTION!
DANGER!
Verify that all input power sources to the drives to be
Wait at least 5 minutes for the drive’s electrolytic
Do not touch any
Verify that the
7
6. Repeat steps 1, 2, 4 and 5 above to connect another drive to Channel B on the
MDB-100, if desired.
7. Remove the cover of the MDB-100 by removing the 4 cover screws.
8. Configure the Modbus network characteristics such as baud r at e, parity etc. via 8position DIP switch SW1 ( r efer to section 7). If the MDB-100’s station address is
to be configured locally, select the desir ed st ation address via 8-position DIP
switch SW2 (refer to section 8).
9. Reinstall the cover of the MDB-100.
10. Connect the Modbus network cable (2 signal wires + shield) to the 3-position
pluggable terminal block m ar ked “Network” on the left-hand side of the MDB-100.
The terminal ordering for the network cable wiring is as shown in Figure 1.
A
B
SHIELD
Figure 1: Modbus RS485 Network Terminal Wiri ng
Note that some RS485 equipment manufacturers reference t he “ A” and “ B”
terminals reversed from the MDB-100’s hardware, and some manufacturers use
other labels, such as “+” and “-“. If you cannot communicate with the MDB-100
after installation, try switching t he “ A” and “ B” signal wires - swapped signal wires
are the most common cause of communication difficulties in new RS485 network
installations.
Ensure that the Modbus network cable is tightly screwed into the terminals, and
route the cable such that it is located well away from any drive input power or
motor wiring. Also take care to r out e all cables away from any sharp edges or
positions where they may be pinched.
11. Take a moment to verify that the MDB-100 and all network cables have suff icient
clearance from drives, motors , and power-carrying electrical wiring.
12. Turn the power sources to all connected drives ON, and verify that the drives
function properly. If t he dr ives do not appear t o power up, or do not function
properly, immediately turn power OFF.
power from the drives.
Then, verify all connections. Contact ICC or your local
Repeat steps 1 and 2 to remove all
drive distributor or manufacturer for assistance if the problem per sists.
8
4. Equipment Specifications
Item Specification
Operating Environment
Operating Temperature
Storage Temperature
Relative Humidity
Vibration
Grounding SHIELD terminal connected to isolated network ground
Cooling Method Self-cooled
Indoors, less than 1000m above sea level, do not
expose to direct sunlight or corrosive / explosive gasses
-10 ∼ +40°C (+14 ∼ +104°F)
-25°C ∼ +65°C (-13 ∼ +149°F)
20% ∼ 90% (without condensation)
5.9m/s
via 200Ω resistance.
2
{0.6G} or less (10 ∼ 55Hz)
5. Maintenance And Inspection
Preventive maintenance and inspection is required to maint ain t he MDB-100 Modbus
interface in its optimal condition and t o ensur e a long operational lifetime. Depending
on usage and operating conditions, perform a periodic inspection once every three to
six months. Before starting inspect ions, always turn off all power supplies to
connected drives, and wait at least five minutes after each drive’s “CHARGE” lamp
has gone out.
DANGER!
to the drives, or for at least 5 minutes after power to the drives has been
removed. A hazard exists temporarily for electrical shock even if the source
power has been removed.
Inspection Points
• Check that the Modbus network connector screws and terminal block plug are not
loose. Tighten if necessary.
• Check that the drive communication cables are not loose. Reinsert if necessary.
• Visually check all wiring and cables for damage. Replace as necessary.
• Clean off any accumulated dust and dirt.
Do not touch any internal parts with power applied
• If use of the MDB-100 is discontinued f or extended per iods of time, apply power
at least once every two years and confirm that the unit still functions properly.
• Do not perform hi-pot t est s on t he drives or MDB-100 interface, as they may
damage the units.
Please pay close attention to all periodic inspection points and maintain a g ood
operating environment.
9
6. Storage And Warranty
6.1 Storage
Observe the following points when the MDB-100 interface is not used imm ediat ely
after purchase or when it is not used for an extended per iod of time.
• Avoid storing the MDB-100 in places that are hot or humid, or t hat contain large
quantities of dust or m etallic dust. Store the MDB-100 in a well-ventilated
location.
• When not using the MDB-100 interface for an extended period of time, apply
power at least once every two years and confirm that it still functions properly.
6.2 Warranty
The MDB-100 Modbus RTU / ASCII Communications Interface is covered under
warranty by ICC for a period of 12 months from the date of installat ion, but not to
exceed 18 months from the date of shipm ent from the factory. For further warranty
or service information, please contact Industrial Control Communications or your
local distributor.
10
7. Network Characteristics Configuration
The MDB-100 interface board uses an 8-position DIP switch (labeled SW1) to
configure the Modbus network communication characteristics. The switch settings
are only read during initialization, so if a chang e is m ade to any of the switches on
SW1, the MDB-100 must be r eset in order to enable the new settings. The various
configuration setting s of switch SW1 are as follows:
Communication Method:
SW1 #
1
OFF Modbus RTU (factory default)
ON Modbus ASCII
Baud Rate:
4 3 2
OFF OFF OFF 300 baud
OFF OFF ON 600 baud
OFF ON OFF 1200 baud
OFF ON ON 2400 baud
ON OFF OFF 4800 baud
ON OFF ON 9600 baud (factory default)
ON ON OFF 19.2 kbaud
ON ON ON 38.4 kbaud
Parity:
SW1 #
6 5
OFF OFF even parity (factory default)
OFF ON odd parity
ON OFF no parity (2 stop bits)
ON ON no parity (1 stop bit) - applies only to RTU mode
Protocol:
SW1 #
Function
Function
Function
SW1 #
7
OFF Modicon Modbus (factory default)
ON DO NOT SELECT (reserved for future expansion)
Station Number Origin:
SW1 #
8
OFF Drive A’s inverter number parameter (factory default)
ON Switch SW2 address setting
11
(refer to section 8)
Function
Function
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