Contemporary Control Systems MR-AO4 User Manual
Analog Output Module
MR-AO4
1108351302
1. Description
The Modbus module with 4 analog outputs is designed for local
switching operations. It is suitable as variable encoder, for example ventilation or mixing valves, valve positions etc. The outputs can be adjusted via a Modbus- Master. Setting of the slave
address, bit rate and parity is done with the two address
switches (x1 / x10) on the front. Possible settings are addresses 00
to 99 and bit rates 1200, 2400, 4800, 9600, 19200, 38400, 57600
und 115200 Bd.
The device does not participate in bus communication if the
address is 00 (reserved for broadcast commands).
Communication with the master can be monitored with a
watchdog timer. If master or communication fail the outputs are
switched to their basic state (secure state) and the red LED is lighting. The timer restarts with each valid message addressed to the
device. When defining the time constant it is necessary to take
account of the baud rate, the number of slaves on the bus and the
length of the messages per slave.
2. Declaration of Conformity
The device was tested according to the applicable standards.
Conformity was proofed. The declaration of conformity is
available at the manufacturer BTR NETCOM GmbH.
Notes Regarding Device Description
These instructions include indications for use and mounting of
the device. In case of questions that cannot be answered with
these instructions please consult supplier or manufacturer.
The indicated installation directions or rules are applicable to
the Federal Republic of Germany. If the device is used in other
countries it applies to the equipment installer or the user to
meet the national directions.
Safety Instructions
Keep the applicable directions for industrial safety and prevention of accidents as well as the VDE rules.
Technicians and/or installers are informed that they have to
electrically discharge themselves as prescribed before installation or maintenance of the devices.
Only qualified personnel shall do mounting and installation
work with the devices, se e section “qualified personnel”.
The information of these instruc tions have to be read and understood by every person using this device.
7162/899293
Symbols
Warning of dangerous electrical voltage
Dange r
means that non- obser vance may cause risk of life,
grievous bodily harm or he avy material damage.
Qualified Personnel
Qualified personnel in the sense of these instructions are persons
who are well versed in the use and installation of such devices
and whose professional qualification meets the requirements of
their work.
This includes for example:
• Qualification to conne ct the device according to the VDE
specifications and the local regulations and a qualific ation to
put this device into operation, to power it down or to activate
it by respecting the internal directions.
• Knowledge of safety rules.
• Knowledge about application and use of the device within the
equipment system etc.
3. Technical Data
Modbus Interface
Protocoll Modbus RTU
Transmission rate 1200 ... 115200 Bd
(factory set ting 19200 Bd Even)
Cabling RS485 two wire bus with voltage
equalizing cable in bus / line topology
Supply
Operating volt age range 20 ... 28 V AC/DC (SELV)
Current consumption 50 mA (AC ) / 20 mA (DC)
Relative duty cycle 100 %
Output
Output voltage 4 x 0 ... 10 V DC
Output current 5 mA at 10 V DC
Resolution 0.625 mV / Digit
Error 100 mV
Housing
Dimensions Wx HxD 1.4 x 2.8 x 2.6 in. (35 x 70 x 65 mm)
Weight 72 g
Mounting position any
Mounting standard rail TH35 per IEC 60715
Mounting in series the maximum quantity of modules
without space connected in line is limited to 15 or to
a maximum power consumption of
2 Amps (AC or DC) pe r connection to
the power supply. For any similar
block of additional modules a
separate connection to the power
supply is mandatory.
Continuation Technical Data
Material
Housing Polyamide 6.6 V0
Terminal blocks Polyamide 6.6 V0
Cover plate Polycarbonate
Type of protection
(IEC 60529)
Housing IP40
Terminal blocks IP20
Terminal blocks
Supply and bus
4 pole terminal block max. AWG 16 (1,5 mm²) solid wire
max. AWG 18 (1,0 mm²) stranded wire
Wire diameter min. 0.3 mm up to max. 1.4 mm
(terminal block and jumper plug are
included to each packing unit)
Module connection
Input /Output max. AWG 12 (4.0 mm²) solid wire
max. AWG 14 (2.5 mm²) stranded wire
Wire diameter min. 0.3 mm up to max 2.7 mm
Temperature range
Operation -5 °C ... +55 °C
Storage -20 °C ... +70 °C
Protective circuitr y polarity reversal protection of
operating voltage
polarity reversal protection of supply
and bus
Display
Operating and bus activity green LED
Error indication red LED
4. Wiring Diagram
A2=C2=GND
5. Connection Diagram
C2 4 C2 3
24VAC/DC
A1
A2
B+
A-
1
C2
GND
BUS B+
BUS A-
A1
A2
B+
A-
C2
2
METZ CONNECT | Im Tal 2 | 78176 Blumberg | Germany | Phone +49 7702 533-0 | Fax +49 7702 533-433
Distributed by RIA CONNECT GmbH and BTR NETCOM GmbH
Mounting instruction see www.metz-connect.com
6. Mounting
Power down the equipment
Mount the module on standard rail (TH35 per IEC 60715 in
junction boxes and/or on distribution panels).
Installation
Electric ins tallat ion and device te rminat ion shal l be done by
qualified persons only, by respecting all applicable
specifications and regulations.
Plug in the terminal block for bus connection
21
Connect the cable for bus supply
5 mm
43
Mounting in series
65
The module can be aligned w ithout interspace. Use the jumper
plug to connect bus and supply voltage when the modules are
mounted in series.
The max imum quantity o f modules conne cted in l ine is lim ited to 15 or to a ma ximum power consumption of 2 Amps
(AC or DC ) per connecti on to the power supply. For any
simila r block of additi onal mod ules a se parate co nnection
to the power suppl y is manda tory.
7. Bit rate and Parity setting
The bit rate and parity can be set in the programming mode when
ajumper is plugged behind the front cover of the module. This
jumper is removed in normal mode. A connection to the bus is
not required during bit rate setting.
The bit rate of the modules can be set in the following way:
1. remove the front cover of the module;
2. plug a jumper to the two middle pins of the 4 pole header
between the red and green LED ( Á);
3. set the desired parity and bit rate with the address s witches
(Â) in accordance to the chart below.
x10
x1
BUSY
C22
+24V
GND
B+
A
3C24
-
C2
24V 24V
+24V
GND
B+
A
-
ERROR
Jumper below
1
the faceplate
A
O
MR-AO4
MODBus RTU
C2
1
4. switch on the supply voltage of the module; it is now permanently saving the bit rate in an EEPROM;
5. switch off the supply voltage of the module;
6. remove the jumper from the header and place the front
cover.
Switch
1 2 3
x10
Parity even odd none
Switch
1 2 3 4 5 6 7 8
x1
Bitrate
1200 2400 4800 9600 19200 38400 57600 115200
(Bit/s)
If the settings differ from the settings specified in the chart the
factory setting applies.
Factory setting: 19200 Bd Even
9. Software description
9.1 I/O Commands
“03 (0x03) Read Holding Registers”
Holding Register 0-3: Output values of the outputs
Signed Integer16,
Holding Register 4-7: Basic settings
of the output values
Request
Valid Register Starting Address 0..7 or 66
Valid Quantity of Registers 1..8 or 1
Response
Byte Count 2 x Quantity of Registers
Values Register 0..7 0x0000 to 0xFFFF
(0x7FFF = 10,24 Volt )
Einheit = 10,24V / 215 = 1V / 3200 = 0,3125 mV
Value Register 66
Time constant for communication monitoring.
Register Value = 0 (0x0000) there is no communication
monitoring, all other values are for communication monitoring
with a solution of 10 ms.
0x00 00 to 0xFFFF => 0 to 655,35 se conds = 10,9 minutes
“06 (0x06) Write Single Re gister”
Request
Valid Register Address 0..7 or 66
Valid Value Register 0..7 0x0000 to 0xFFFF
(0x7FFF = 10,24 Volt )
Valid Value Register 66 0x0000 to 0xFFFF
(0 to 655,35 seconds )
Response
Echo of the request
“16 (0x10) Write Mu ltiple R egisters”
Request
Valid Register Starting Address 0..7
Valid Quantity of Registers 1..8
Valid Byte Count 2 x Quantity of Registers (QoR)
Valid Value Register 0..7 QoR x 0x0000 to 0xFFFF
(0x7FFF = 10,24 Volt )
Response
Function Code, Register Starting Address, Quantity of Registers
9.2 Bit rate setting with Modbus command
Parity and bit rate have the same value as when setting them by
address switch.
If Parity or Bit has the value 0, no setting or storage is carried
out.
The register content is stored in the EEPROM.
Continuation Software description
“06 (0x06) Write Single Register”
Request
Valid Register Address 0x41 ( 65 )
Valid Register Value 2 Bytes
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x53 Parity Bit rate
Bit 15-8: Magic-Number 0x53 = 83 as protection against
accidental writing.
The command will be further analysed only with this
number.
Bit 7-4 1 2 3
Parity even odd none
Bit 3-0 1 2 3 4 5 6 7 8
Bit rate 1200 2400 4800 9600 19200 38400 57600 115200
Response
Echo of Request
Examp le for a fra me:
Slave address 0x12 Setting of rotary switch (18)
Function 0x06 Write Single Register
Register address Hi 0x00
Register address Lo 0x41 Bit rate and parity (65)
Register contents Hi 0x53 Magic-Number
Register contents Lo 0x15 Parity Even, 19200 Baud
All devices can be switched simultaneously with a Broadcast command (Slave address 0x00) However, it is advised not to do so as
this can c ause problems:
- Devices from other manufacturers may have under this
address a register for a different purpose that will then be
operated in the wrong way.
- There is no feedback from the individual devices.
Consequently the control cannot immediately recognize if
the command was correctly received.
It is safe r to addre ss and switch each device individually.
The device will then answer with the old settings of parity and
bit rate. Switching will take place only after wards. However, the
answer can get lost if the bus is disturbed.
When all devices are switched; it is advised to check communication. Any function of the device providing a feedback is suit able.
If a single function is to be used being independent from the
process periphery then the function „Diagnostic“ sub-function
„Return Quer y Data“ is suitable, it returns the transferred data.
If bit rate and parity setting of a device are unknown it is possible
to address the device successively with all combinations of bit
rate and parity until the device answers. Try the most likely com-
binations firs t. Try the lower bit rates last as they take longer.
METZ CONNECT | Im Tal 2 | 78176 Blumberg | Germany | Phone +49 7702 533-0 | Fax +49 7702 533-433
Distributed by RIA CONNECT GmbH and BTR NETCOM GmbH
Mounting instruction see www.metz-connect.com
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