Contemporary Control Systems Modbus Cube I/O MR-AI8 - Manual (Page 3)

Continuation Software Description
Configurations Registers are shown above in a way to display
the meaning of the individual bit. For the application it is more
convenient if the register contents is displayed as a whole, see
the following chart.
Bit 15-8: occupied
Bit 7:
0 = voltage or resistance
Bit 6-5: range, defines input circuit or measuring range
0 0 voltage 0to10 V (factory setting)
0 1 voltage 0to10 V, with Pullup 2k at 5 V
1 0 resistance
1 1 occupied
Bit 4-0: number, defines presentation of value
Voltage measurement:
0 value with data type float, unit = 1V
(factory setting)
1 value with data type signed int,
unit = 10.24 V/2 15 = 1V/3200 = 0.3125 mV
2-31 reserved for other presentations
Resistance measurement:
0 value with data type float,
unit = 1 W
1 value with data type signed int,
unit = 0.1 W (max. 3.2767 kW)
2 value with data type signed int,
unit = 1 W (max. 32.767 kW)
3 value with data type signed int
unit = 10 W (max. 327.67 kW)
4 value with data type signed int
unit = 100 W (max. 3276.7 kW)
5-31 reserved for other presentations
Configuration Register for voltage or resistance measurement:
Bit 15-8: occupied
Bit 7:
1 = temperature with sensor characteristic
Bit 6-1: number, serves to distinguish between sensor and
measuring range
0 Sensor PT100 (-50..150 °C)
1 Sensor PT500 (-50..150 °C)
2 Sensor PT1000 (-50..150 °C)
3 Sensor NI1000-TK5000 (-50..150 °C)
4 Sensor NI1000-TK6180 (-50..150 °C)
5 Sensor BALCO 500 (-50..150 °C)
6 Sensor KTY81-110 (-50..150 °C)
7 Sensor KTY81-210 (-50..150 °C)
8 Sensor NTC-1k8 (-50..150 °C)
9 Sensor NTC-5k (-50..150 °C)
10 Sensor NTC-10k (-50..150 °C)
11 Sensor NTC-20k (-50..150 °C)
12 Sensor LM235 (-40..120 °C)
13-55 reserved for other sensors
56-61 use of interpolations chart see below
62-63 occupied
Bit 0: Data type of value
0 float, unit 1°C
1 signed int, unit 0,1°C
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 1 number Type
Configuration Register for the use of the Interpolation chart:
This chart can be used to linearize individually defined sensor
characteristics.
Bit 15-8: occupied
Bit 7:
1 = temperature with sensor characteristic
Bit 6-4: 7 = interpolation chart
Bit 3-2: range, defines input circuit or measuring range
0 0 voltage 0-10V
0 1 voltage 0-10V, Pullup 2k at 5V
1 0 resistance
1 1 occupied
Bit 1: selection of interpolation
0 sensor characteristic is approx. linear
1 sensor characteristic is approx.
exponential (NTC)
Bit 0: data type of value
0 float, unit 1 °C
1 signed int, unit 0.1 °C
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 1 7 range Int Type
Dez Hex Measuring range Data type Unit Maximum
Voltage or
resistance
0 0x00 Voltage 0-10 V float 1 V
1 0x01 Voltage 0-10 V signed int 0,3125 mV 10,24 V
32 0x20 Voltage/Pullup float 1 V
33 0x21 Voltage/Pullup signed int 0,3125 mV 10,24 V
64 0x40 Resistance float 1 W
65 0x41 Resistance signed int 0,1 W 3,2767 kW
66 0x42 Resistance signed int 1 W 32,767 kW
67 0x43 Resistance signed int 10 W 327,67 kW
68 0x44 Resistance signed int 100 W 3276,7 kW
Temperature measurement with data type float.
(Value charts for sensors see annex):
128 0x80 Sensor PT100 float 1 °C (-50..150 °C)
130 0x82 Sensor PT500 float 1 °C (-50..150 °C)
132 0x84 Sensor PT1000 float 1 °C (-50..150 °C)
134 0x86 Sensor NI1000-TK5000 float 1 °C (-50..150 °C)
136 0x88 Sensor NI1000-TK6180 float 1 °C (-50..150 °C)
138 0x8A Sensor BALCO 500 float 1 °C (-50..150 °C)
140 0x8C Sensor KTY81-110 float 1 °C (-50..150 °C)
142 0x8E Sensor KTY81-210 float 1 °C (-50..150 °C)
144 0x90 Sensor NTC-1k8 float 1 °C (-50..150 °C)
146 0x92 Sensor NTC-5k float 1 °C (-50..150 °C)
148 0x94 Sensor NTC-10k float 1 °C (-50..150 °C)
150 0x96 Sensor NTC-20k float 1 °C (-50..150 °C)
152 0x98 Sensor LM235 float 1 °C (-40..120 °C)
Continuation Software Description Continuation Software Description Continuation Software Description
Dez Hex Measuring range Data type Unit Maximum
Voltage or
resistance
Temperature measurement with data type signed int,
register contents is larger by 1 as above:
129 0x81 Sensor PT100 signed int 0,1 °C (-50..150 °C)
131 0x83 Sensor PT500 signed int 0,1 °C (-50..150 °C)
133 0x85 Sensor PT1000 signed int 0,1 °C (-50..150 °C)
135 0x87 Sensor NI1000-TK5000 signed int 0,1 °C (-50..150 °C)
137 0x89 Sensor NI1000-TK6180 signed int 0,1 °C (-50..150 °C)
139 0x8B Sensor BALCO 500 signed int 0,1 °C (-50..150 °C)
141 0x8D Sensor KTY81-110 signed int 0,1 °C (-50..150 °C)
143 0x8F Sensor KTY81-210 signed int 0,1 °C (-50..150 °C)
145 0x91 Sensor NTC-1k8 signed int 0,1 °C (-50..150 °C)
147 0x93 Sensor NTC-5k signed int 0,1 °C (-50..150 °C)
149 0x95 Sensor NTC-10k signed int 0,1 °C (-50..150 °C)
151 0x97 Sensor NTC-20k signed int 0,1 °C (-50..150 °C)
153 0x99 Sensor LM235 signed int 0,1 °C (-40..120 °C)
Temperature measurement with interpolation chart:
240 0xF0 Voltage 0-10 V float linear
241 0xF1 Voltage 0-10 V signed int linear
242 0xF2 Voltage 0-10 V float exponentiell
243 0xF3 Voltage 0-10 V signed int exponentiell
244 0xF4 Voltage/Pullup float linear
245 0xF5 Voltage/Pullup signed int linear
246 0xF6 Voltage/Pullup float exponentiell
247 0xF7 Voltage/Pullup signed int exponentiell
248 0xF8 Resistance float linear
249 0xF9 Resistance signed int linear
250 0xFA Resistance float exponentiell
251 0xFB Resistance signed int exponentiell
Register 24-63 (0x18-0x3F) interpolation chart
This chart can be used to convert and linearize values for sensors
without a characteristic already defined in the device. The chart
contains up to 10 nodes of the sensor characteristic to interpo-
late between.
Example: conversion from resistance to temperature with tem-
perature sensors.
Register contents is stored in the EEPROM.
The description refers to temperature sensors. Other sensors
than temperature sensors (e.g. humidity) are also possible and it
is also possible to measure voltage instead of resistance.
These properties can be set in the configuration register:
Measuring range: voltage
voltage, Pullup 2k at 5V (e.g. for LM235)
resistance (normal case with temperature
sensors)
Interpolation:
sensor characteristic is approx. linear
sensor characteristic is approx. exponential
(für NTCs)
Data type of value: float (unit 1 °C)
signed int (unit 0.1 °C)
Modbus-Funktionen
“03 (0x03) Read Holding Registers”
“16 (0x10) Write Multiple Registers”
Node Register Register
Temperature Resistance
1 24-25 26-27
2 28-29 30-31
3 32-33 34-35
4 36-37 38-39
5 40-41 42-43
6 44-45 46-47
7 48-49 50-51
8 52-53 54-55
9 56-57 58-59
10 60-61 62-63
The nodes (up to 10) are filled from the beginning of the chart,
it ends with
Temperature = resistance = 0, if less nodes exist.
Temperature and resistance values have to be sorted in ascen-
ding or descending order.
Data type in registers: float temperature, resistance
10.2 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.
“06 (0x06) Write Single Register”
Request
Valid Register Address
0x41 ( 65 )
Valid Register Value 2 Bytes
Bit 15-8: Magic-Number 0x53 = 83 as protection against
accidental writing.
The command will be further analysed only with this
number.
Response
Echo of Request
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x53 Parity Bit rate
Bit 3-0 1 2 3 4 5 6 7 8
Bit rate 1200 2400 4800 9600 19200 38400 57600 115200
Bit 7-4 1 2 3
Parity even odd none
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