Bender FTC470XMB User manual

Power in electrical safety
Operating Manual
FTC470XMB
Protocol converter for the connection of the
Bender measuring interface to the
Modbus RTU
Software version: D143 V2.1x
TGH1367en/06.2010

©Dipl.-Ing. W. Bender GmbH & Co.KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Dipl.-Ing. W. Bender GmbH & Co.KG
Londorfer Str. 65 • 35305 Grünberg • Germany
Postfach 1161 • 35301 Grünberg • Germany
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Web server: http://www.bender-de.com

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Table of Contents
TGH1367en/06.2010
1. How to use this documentation effectively .......................................................... 7
1.1 About the operating manual ...................................................................................................... 7
1.2 Overview of the individual chapters ........................................................................................ 7
1.3 Brief instruction ............................................................................................................................... 8
2. Safety instructions ....................................................................................................... 9
2.1 Work activities on electrical installations ............................................................................... 9
2.2 Intended use ..................................................................................................................................... 9
2.3 Address setting and termination ........................................................................................... 10
2.4 Setting of the DIP switches for Modbus RTU ..................................................................... 10
3. Standard application ................................................................................................. 11
3.1 Bus interface .................................................................................................................................. 11
3.2 Modbus RTU ................................................................................................................................... 11
3.3 Application of the FTC470XMB ............................................................................................... 12
3.4 Restrictions ..................................................................................................................................... 12
4. The FTC470XMB protocol converter ...................................................................... 13
4.1 Scope of delivery .......................................................................................................................... 13
4.2 Display and operating elements ............................................................................................ 13
4.2.1 DIP switch for Modbus RTU address setting ...................................................................... 14
4.2.2 DIP switch for setting the baud rate ..................................................................................... 15
4.2.3 DIP switches for Modbus RTU parity ..................................................................................... 15
4.2.4 Modbus RTU status indicators ................................................................................................. 16
4.2.5 DIP switches for BMS bus address setting .......................................................................... 17
4.2.6 Status indicators for BMS bus and supply voltage .......................................................... 17
4.3 BMS side of the FTC470XMB ....................................................................................................18
4.4 Modbus RTU side of the FTC470XMB — Mode 1 ............................................................. 19
4.4.1 Definition of Mode 1 ................................................................................................................... 19
4.4.2 Communication between Modbus RTU and BMS ........................................................... 19
4.4.3 Setting of the Modbus configuration register ................................................................... 21
4.4.4 Reading out of the BMS data from the Modbus read register ..................................... 23
4.5 Modbus RTU side of the FTC470XMB — Mode 2 ............................................................. 25
4.5.1 Definition of the Mode 2 ........................................................................................................... 25

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4TGH1367en/06.2010
4.5.2 Cyclical data exchange .............................................................................................................. 25
4.5.3 Correct time control of the FTC470XDP by Modbus RTU commands is required. 25
4.5.4 FTC470XMB communicate with the Modbus RTU Master as "BMS Slave" .............. 26
4.5.5 FTC470XMB communicates as the "BMS Master" with the Modbus RTU Master . 26
4.5.6 Communication between Modbus RTU and BMS ........................................................... 27
5. Installation ................................................................................................................... 31
5.1 Basic configuration ..................................................................................................................... 31
5.2 Mounting and connection of the device ............................................................................ 31
5.2.1 Wiring diagram ............................................................................................................................. 32
6. Function ....................................................................................................................... 33
6.1 Requesting alarm messages .................................................................................................... 34
6.1.1 Number of all alarm messages of a BMS device ............................................................... 34
6.1.2 Requesting alarm messages via the channel number ................................................... 35
6.2 Requesting operating messages ............................................................................................ 39
6.2.1 Number of all operating messages of a BMS device ....................................................... 39
6.2.2 Requesting operating messages via the channel number ........................................... 40
6.3 Requesting measuring values .................................................................................................42
6.3.1 Requesting measuring values via the channel number ................................................ 42
6.4 Taking over or returning the Master function ................................................................... 43
6.4.1 Taking over the Master function ............................................................................................ 43
6.4.2 Returning the Master function ............................................................................................... 44
6.5 Parameterization .......................................................................................................................... 45
6.5.1 Requesting the response values via channel number ................................................... 45
6.5.2 Setting the response values via channel number ............................................................ 47
6.5.3 Requesting the delay on response ........................................................................................ 49
6.5.4 Setting the delay on response ................................................................................................ 49
6.5.5 Requesting the CT type ............................................................................................................. 50
6.5.6 Setting the CT type ..................................................................................................................... 50
6.5.7 Requesting the status of CT monitoring ............................................................................. 51
6.5.8 Setting the status of CT monitoring ...................................................................................... 51
6.5.9 Requesting the correction factor for the CT transformation ratio ............................. 52
6.5.10 Setting the correction factor for CT transformation ratio ............................................. 52
6.5.11 Requesting the fault memory ................................................................................................. 53
6.5.12 Setting the fault memory .......................................................................................................... 53
6.5.13 Requesting the operating mode of the alarm relay ........................................................ 54
6.5.14 Setting the operating mode of the alarm relay ................................................................ 54
6.5.15 Requesting the channel function ..........................................................................................55
6.5.16 Setting the channel function ................................................................................................... 55
6.5.17 Requesting the number of measurements per channel ............................................... 56

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6.5.18 Setting the number of measurements per channel ........................................................ 56
6.5.19 Requesting the maximum number of measurements ................................................... 57
6.5.20 Setting the maximum number of measurements ........................................................... 57
6.6 Requesting device-specific information .............................................................................. 58
6.6.1 Requesting fault messages after a self test ........................................................................ 58
6.6.2 Requesting the software version ...........................................................................................59
6.6.3 Requesting the device type and device version ............................................................... 59
6.7 Control commands for use in BMS Master mode ............................................................. 61
6.7.1 Deleting all alarm messages .................................................................................................... 61
6.7.2 Starting a self test of insulation monitoring devices ...................................................... 62
6.7.3 Starting the self test of an EDS system ................................................................................. 62
6.7.4 Buzzer mute ................................................................................................................................... 63
6.7.5 Switching the relay of a specific channel ............................................................................ 63
6.8 Control commands to be used in the BMS Slave mode ................................................ 64
6.8.1 Starting and stopping EDS systems ...................................................................................... 64
6.9 Output of Modbus messages via the BMS bus .................................................................. 65
7. Programming examples mode 1 ............................................................................. 67
7.1 Requesting the operating messages of an RCMS470-12 .............................................. 68
7.2 Requesting the response values of an RCMS470-12 ....................................................... 69
7.3 Requesting the type of CT of an EDS470-12 ...................................................................... 70
7.4 Requesting the correction factor for CT of an RCMS470-12 ......................................... 71
7.5 Requesting the status of CT monitoring of an RCMS470-12 ........................................ 72
7.6 Requesting the channel functions of an RCMS470-12 ................................................... 73
7.7 Requesting the response delay of an RCMS470-12 ......................................................... 74
7.8 Requesting the measuring values of an RCMS470-12 .................................................... 75
8. Programming examples mode 2 ............................................................................. 77
8.1 Alarm messages ............................................................................................................................ 77
8.1.1 Number of alarm messages ..................................................................................................... 77
8.1.2 Alarm messages or information via channel number .................................................... 78
8.2 Operating messages ................................................................................................................... 80
8.3 Measuring values, with regard to the channels ................................................................ 82
8.4 Temporary Master takeover and return ............................................................................... 84
8.4.1 Taking over the Master function ............................................................................................84
8.4.2 Returning the Master function ................................................................................................ 84
8.5 Control commands for use in the Master mode ............................................................... 85
8.5.1 Interrogating the FTC470XMB device type ........................................................................ 87
8.6 Control commands for use in the BMS Slave mode ........................................................ 88
8.6.1 Requesting the measuring value of all channels of an RCMS470-12 ........................ 89

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6TGH1367en/06.2010
8.6.2 Requesting a device type after taking over the Master function by FTC470XMB 90
8.6.3 Parameter setting after the FTC470XMB has taken over the Master function ...... 91
9. Service and support ................................................................................................... 93
9.1 Damage in transit ........................................................................................................................ 93
9.2 Malfunctions .................................................................................................................................. 93
9.2.1 What shall be checked? ............................................................................................................. 93
9.2.2 Where do you get help? ............................................................................................................ 93
9.3 Warranty claims ............................................................................................................................ 93
9.4 Warranty and liability ................................................................................................................. 94
10. Technical data ........................................................................................................... 95
10.1 Technical data in tabular form ................................................................................................ 95
10.2 Dimension diagram .................................................................................................................... 96
10.3 Ordering details ............................................................................................................................ 96

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TGH1367en/06.2010
1. How to use this documentation effectively
1.1 About the operating manual
This operating manual will concern qualified experts in electrical engineering and communica-
tion technology!
In order to make it easier to find certain text passages or references in this manual and for
reasons of comprehensibility, important information is emphasized by symbols. The mean-
ing of these symbols is explained below:
1.2 Overview of the individual chapters
●How to use this documentation effectively:
This chapter provides information about the use of this documentation.
●Safety instructions:
This chapter draws attention to hazards involved with the installation and operation.
●Basic application:
This chapter deals with the normal use of this product.
●The protocol converter FTC470XMB (gateway):
This chapter describes the scope of delivery, the operating and display elements available at
the device, the function of the protocol converter as well as the intended use.
●Installation:
This chapter describes the device settings which are to be set prior to installation and the instal-
lation itself.
●Function:
This chapter includes a summary of all Modbus RTU commands that can be transmitted to the
FTC470XMB converter.
●Programming examples mode 1 and mode 2:
These chapters contain various programming examples which are intended to help you to con-
figure the FTC470XMB.
Information calling attention to hazards are marked with this warning symbol.
Information intended to assist the user to make optimum use of the product are
marked with the Info symbol.

How to use this documentation effectively
8TGH1367en/06.2010
●Service and support:
This chapter offers service and support in case of a fault. In addition you will find information
about the technical sales department.
●Appendix:
This chapter provides an overview of technical data, a dimension diagram as well as the order-
ing details.
1.3 Brief instruction
If you are familiar with automation engineering, particularly with the Modbus RTU, it may
be helpful to start right away with "Chapter 4. The FTC470XMB protocol converter" and
"Chapter 5. Installation". In chapter 4 you will find information about the BMS-Modbus com-
munication model including the ID numbers and start addresses required for read and write
access. Chapter 5 provides information about the basic configuration, installation as well as
the connection of the FTC470XMB. Furthermore a wiring diagram is provided.

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TGH1367en/06.2010
2. Safety instructions
2.1 Work activities on electrical installations
●All work activities necessary for installation, commissioning or work activities during operation
of electrical devices or systems are to be carried out by adequately skilled personnel.
●Observe the relevant regulations applying to work on electrical installations, in particular DIN
EN 50110 or its subsequent regulation.
●If the equipment is used outside the Federal Republic of Germany, the respective national
standards and regulations are to be observed. The European standard EN 50110 is recom-
mended to be used as a directive.
2.2 Intended use
The FTC470XMB protocol converter connects the serial Bender BMS bus to the serial Modbus
RTU. The converter is capable of transmitting information from the BMS bus to the Modbus
RTU and vice versa.
Interface on the Modbus RTU side:
Hence, the Modbus RTU Master must be informed about the protocol converter and its Mod-
bus RTU address.
Interface on the BMS side:
The FTC470XMB can be operated either as Master or as Slave.
Unprofessional work activities on electrical installations may result in
personal injury!
FTC470XMB is always operated as a Slave on the Modbus RTU
FTC470XMB must take over the Master function if
- parameters are requested or modified
- or special control commands are given

Safety instructions
10 TGH1367en/06.2010
2.3 Address setting and termination
A prerequisite for proper functioning of the FTC470XMB protocol converter is its correct ad-
dress setting and termination.
Ensure correct address setting and termination of the FTC470XMB. For details refer to the
chapter basic configuration on page 31.
2.4 Setting of the DIP switches for Modbus RTU
Addresses assigned twice may lead to serious malfunctions in BMS or
Modbus RTU systems.
After each modification of the DIP switch settings, the FTC470XMB must be dis-
connected from the supply. Connecting it to the power supply again provides
the actual indication of the Modbus RTU status.

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3. Standard application
3.1 Bus interface
In common building services management systems (GLT) as well as in other areas of auto-
mation engineering a variety of field buses are used. Bender systems like EDS46x/47x/49x,
RCMS46x/47x/49x and MEDICS communicate with each other via the Bender Measuring In-
terface BMS.
Our protocol converter FTC470XMB (gateway) is intended to connect this BMS interface to
the Modbus RTU. For that purpose, the FTC470XMB is connected to the Modbus RTU net-
work in the function of a Modbus RTU Slave.
Fig. 3.1: block diagram of an interface between the BMS bus and Modbus RTU
3.2 Modbus RTU
The fieldbus Modbus RTU (Remote Terminal Unit) has been specified by Modicon, a subsid-
iary of Schneider Automation and is freely available to the public with no licensing fees or
use restrictions. Modbus uses the serial hardware interface RS485 and communicates via a
two-wire, twisted copper wire. The standard transmission rate is 19200 baud. Reference val-
ues are as follows:
●Master-Slave communication
●up to 32 stations per network, up to 247 stations with the use of a repeater
●baud rate between 1200 and 57600 bit/s
●Diagnosis mechanism
120 W
A B A B A B
max. 1200 m
max. 1200 m
BA
120 W
FTC470XMB
Bender-Messgeräte-Schnittstelle (BMS-Bus)
Modbus-RTU
Modbus-
Slave
Modbus-Master
Modbus-
Slave
Modbus-
Slave

Standard application
12 TGH1367en/06.2010
3.3 Application of the FTC470XMB
The connection of Bender systems to the BMS bus and to the Modbus RTU by means of the
FTC470XMB can become necessary for several reasons:
●A Modbus RTU device is expected to respond to an event in the BMS world.
●A BMS interface device is expected to respond to an event in the Modbus RTU world.
●The BMS interface data and the Modbus RTU data are intended to be indicated and evaluated
centrally on a personal computer using Modbus RTU software.
●The BMS interface data are to be indicated in the software of a building services management
system incorporating a Modbus RTU interface.
●The configuration of devices of the BMS side is to be carried out via a personal computer with
Modbus RTU interface.
●The control of certain BMS interface activities is to be carried out via the Modbus RTU.
3.4 Restrictions
Some Bender devices like TM operator panels or PRC1470 use in addition to the internal in-
terface an external interface capable of connecting such devices to extended networks. This
external interface cannot be addressed by the FTC470XMB. In BMS systems including TM
operator panels or PRC1470 these components can only communicate with the FTC470XMB
via the internal interface. Also refer to page 21.

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TGH1367en/06.2010
4. The FTC470XMB protocol converter
This chapter describes:
●the scope of delivery
●the display and operating elements on the device
●the function of the protocol converter (gateways)
●the intended use
4.1 Scope of delivery
Included are:
●the FTC470XMB protocol converter
●the technical manual
4.2 Display and operating elements
Fig. 4.1: FTC470XMB front plate
Legend to front plate
1RS485 socket for Modbus RTU cable: 9 pole Sub-D
2DIP switch for Modbus RTU termination:
„ON“ = terminating resistor activated
3DIP switch for binary Modbus RTU address setting: 1....127 (detailed information below)
4DIP switch for binary Modbus RTU address setting: 1200....57600 bit/s (detailed info. below)
5DIP switch for binary Modbus RTU address setting: none/even/odd (detailed info. below)
6Modbus RTU status indication (detailed info. below)
7BMS bus status indication (detailed info. below)
8DIP switch for binary BMS bus address setting: 1-30 (1 = Master mode) (detailed info. below)
12345
ON
234 6
7
FTC470XMB
8
5
ADRESS MODBUS BAUDR. PARITY
A6 A5 A4 A3 A2 A1 A0 B2 B1 B0 P1 P0
DIAG
ACTIVE BF
RUN

The FTC470XMB protocol converter
14 TGH1367en/06.2010
4.2.1 DIP switch for Modbus RTU address setting
The appropriate addresses are set using BCD numbers between 1 an 127.
Selecting Modbus address 0, with all DIP switches in position OFF, would be an invalid ad-
dress which is not allowed!
The FTC470XMB must be disconnected from the supply after changing the DIP
switch settings. Reconnection to the power supply provides the actual indica-
tion of the Modbus RTU status.
DIP switch of the Modbus group in down position means binary 1
DIP switch of the BMS group in up position means binary 0
Address DIP switch
Dec.addr.1234567
1 0000001
2 0000010
3 0000011
4 0000100
5 0000101
6 0000110
7 0000111
8 0001000
.. .. .. .. .. .. .. ..
... ... ... ... ... ... ... ...
127 1111111
ON ON ON
1 1 2 3 4 5 6 7 8 1 2 3 4
A6 A5 A4 A3 A2 A1 A0
ADDRESS MODBUS
0
1

The FTC470XMB protocol converter
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4.2.2 DIP switch for setting the baud rate
Valid baud rates can be set between 1200 bit/s and 57600 bit/s. The standard value for Mod-
bus RTU is 19200 bit/s.
Setting 0, all DIP switches in position OFF, is invalid and not allowed!
4.2.3 DIP switches for Modbus RTU parity
Valid parity settings are none/even/odd. The standard value for Modbus RTU is "none pari-
ty“. If Parity is none two stop bits are used, if parity is even or odd only one stop bit is used.
Setting 0 -all DIP switches in OFF position- is invalid and must not be used!
Baud rate DIP
switches
Bit/s 812
1200 0 0 1
2400 0 1 0
4800 0 1 1
9600 1 0 0
19200 1 0 1
38400 1 1 0
57600 1 1 1
Parity
DIP
switches
Parity 3 4
none 0 1
even 1 0
odd 1 1
ON ON ON
1 1 2 3 4 5 6 7 8 1 2 3 4
B2 B1 B0
BAUDR.
0
1
ON ON ON
1 1 2 3 4 5 6 7 8 1 2 3 4
PARITY
P1 P0
0
1

The FTC470XMB protocol converter
16 TGH1367en/06.2010
4.2.4 Modbus RTU status indicators
LED Meaning
ACTIVE
Bus in operation
Green LED lights up sporadically:
The Modbus module answers to requests (data exchange)
BF
Bus error
Red LED lights up:
FTC470XMB is not connected to the Modbus RTU
or the CRC error rate is above 10%.
Data exchange is not possible
RUN
Bus function
Green LED lights up:
FTC470XMB is connected to the Modbus RTU and is ready for data
exchange.
DIAG
Status of DIP switch settings (only Modbus RTU)
Status LED red:
all Modbus switches are in "OFF" position or an invalid value has been set.
Status LED green:
The settings of the Modbus DIP switches have been modified by mail box
commands.
Status LED does not light:
DIP switch settings are correct and are used

The FTC470XMB protocol converter
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4.2.5 DIP switches for BMS bus address setting
Table 4.1: BMS bus address setting
4.2.6 Status indicators for BMS bus and supply voltage
Dec.
addr. A4 A3 A2 A1 A0 Dec. addr. A4 A3 A2 A1 A0
1 00001 16 10000
2 00010 17 10001
3 00011 18 10010
4 00100 19 10011
5 00101 20 10100
6 00110 21 10101
7 00111 22 10110
8 01000 23 10111
9 01001 24 11000
10 01010 25 11001
11 01011 26 11010
12 01100 27 11011
13 01101 28 11100
14 01110 29 11101
15 01111 30 11110
LED Meaning
ON Green Power ON LED lights in case of correct power supply.
ALARM Yellow alarm LED lights when an alarm message is being transmitted to
the BMS side of the Modbus RTU.
FAULT
Yellow fault lights in case of disturbances on the BMS bus, when an
invalid BMS address has been set and/or in case of FTC470XMB malfunc-
tions.
BMS Yellow BMS LED shows activities on the BMS bus.
A4 A3 A2 A1 A0
ADDRESS BMS
1
0

The FTC470XMB protocol converter
18 TGH1367en/06.2010
4.3 BMS side of the FTC470XMB
On the BMS side, the FTC470XMB can be used either as Master or as Slave.
●BMS address 1 = Master mode
●BMS address 2 to 30 = redundant Master mode
●BMS address 2 to 30 = Slave mode
●Data transmission rate = 9600 baud
The following data is available on the BMS bus.
Alarm and operating messages
Bender devices connected to the BMS bus cyclically send their alarm and operating messag-
es. Each device can store up to 12 alarm and operating messages in the channels 1-12.
Diagnostics and parameterization
This data is only sent to the bus if requested by BMS commands.
Redundant Master function
FTC470XMB can be used as a redundant Master. In the event failure of the regular Master
(bus address 1) the FTC470XMB takes over the Master function after approximately 60 sec-
onds in order to control the BMS bus. If the regular Master becomes active again, the "redun-
dant" FTC470XMB returns the Master function.
In case of failure of the regular Master tried first the BMS device with BMS address 2 to take
over the Master function. If the taking over does not succeed, address 3 etc. follows. That
means, a FTC470XMB with the BMS address 2 takes over the redundant Master function fast-
er than equipment with the address 30.
It is recommended to use the Master mode for fast data access.
The FTC470XMB provides the redundant Master function when the BMS address
2 to 30 was assigned to.

The FTC470XMB protocol converter
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4.4 Modbus RTU side of the FTC470XMB — Mode 1
In this manual, the Modbus RTU is generally viewed from the perspective of the Modbus RTU
Master.
4.4.1 Definition of Mode 1
If FTC470XMB is operating in Mode 1, the Modbus Master can query values and functions
from the BMS net, but a parameterization of network BMS devices is not possible. For the
respective requests, the Modbus Master must set the configuration registers of the
FTC470XMB. For this purpose, the registers are reserved with the following options:
●BMS addresses: 1...150
●BMS instruction codes: 4, 30, 32, 35, 37, 39, 48 and 105
4.4.2 Communication between Modbus RTU and BMS
The assignment of input data and output data is organized over the configuration registers
of the FTC470XMB. Therefore, the Modbus Master must set the configuration register con-
sisting of 10 segments in an appropriate way. 10 address ranges of the read register are per-
manently linked with the 10 segments of the configuration register. Details of these linkages
are described further below.
Description of data exchange
Communication between the components is carried out as follows:
1. The Modbus Master makes an request possible by setting the FTC470XMB configuration regis-
ter. It writes the BMS address of a BMS device to be queried and the associated BMS instruc-
tion. 10 segments allow 10 devices with 12 channels each to be configured for requests in one
configuration cycle.
2. Next, the Modbus Master reads the requested data from the Modbus read register of the
FTC470XMB. This can take place uniquely or in a cyclic manner, depending upon the program-
ming.
FTC470XMB can be operated in Mode 1 or in Mode 2 or even alternately. This is
possible since different memory ranges are used for both modes.

The FTC470XMB protocol converter
20 TGH1367en/06.2010
Address ranges for configuration- and input data
●The configuration data (BMS instruction code and BMS device address)
of the Modbus Master are always written into the configuration register of the FTC470XMB
Modbus Slave. Altogether, 10 register segments with the following pre-defined segment
addresses are available:
●The input data (read access)
of the Modbus Master are also read out from pre-defined read registers of the FTC470XMB. The
segment addresses of the read registers are coupled to those of the configuration registers
using an offset of 400h. The address range for read accesses is pre-defined as:
0x0406 0x041F 0x0438 0x0451 0x046A 0x0483 0x049C 0x04B5 0x04CE 0x04E7
Start address
read register
Address range
read register
0x0006 0x0006... 0x001E
0x001F 0x001F ... 0x0037
0x0038 0x0038 ... 0x0050
0x0051 0x0051 ... 0x0069
0x006A 0x006A ... 0x0082
0x0083 0x0083 ... 0x009B
0x009C 0x009C ... 0x00B4
0x00B5 0x00B5 ... 0x00CD
0x00CE 0x00CE ... 0x00E6
0x00E7 0x00E7 ... 0x00FF