SIGMATEK C-DIAS Technical Data Manual

C-DIAS ANALOG INPUT MODULE CAI 042

C-DIAS Analog Input Module CAI 042

4 x resistance

The calibratable CAI 042 DMS module is used to record data
from resistance measurement bridges (e.g. load cells). With an
18-bit resolution, measurement values with an accuracy of
±0,01% are available.

Technical Data

Analog Channel Specifications

Number of channels 1,2 or 4
Load cells parameter 2mV / V
Measurement range ±20 mV
Measurement value ±105000 d
Resolution Internal 24 bit

Conversion time for all channels 14ms / 4 Channel drive

Bridge supply voltage 10V
Maximum load of the voltage

supply (entire supply)
Maximum resistance per channel

(using all 4 channels)
Allowable resistance (parallel

circuit of all 4 bridges)
Analog channel measurement

accuracy

measurement bridges ±2mV / V

(From the 18 bit measurement value)

8ms / 2 Channel drive
4ms / 1 Channel drive

135mA

300Ohm to 5000Ohm

75Ohm to 5000Ohm

±0,01% of maximum measurement value

(With an operating temperature from 0 to +40°C)

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C-DIAS ANALOG INPUT MODULE CAI 042

Number of filters per channel 2 (1 fix, 2. 4-step settable)
Calibratable Yes
Serial interface Analysis with hyper terminal possible

So that the maximum load for the reference voltage is not exceeded, a maximum of 4

bridges with a minimum resistance of 300Ohms can be connected to the CAI 042.

Here, it doesn’t matter if 4 bridges are connected parallel with one channel or if each

channel is connected to a single bridge.

Afin de ne pas dépasser la charge maximale de la tension de référence, au maximum 4

ponts d’une résistance supérieure ou égale à 300 ohms peuvent être connectés à la

CAI 042. Il est sans importance si quatre ponts sont connectés en parallèle avec un canal

ou si chaque canal est connecté à un seul pont.

Step response of the analog and digital filters (20mV steps)

100000

80000

60000

40000

Filterausgang [dezimal]

Filter 2-1
Filter 2-2

20000

0

0 10203040506070809010

Samples [n]

Filter 2-3
Filter 2-4
Filter 1

0

Electrical Requirements

Supply from C-DIAS Bus +5V and +24V
Current consumption of the

C-DIAS Bus (+5 V supply)
Current consumption of the

C-DIAS Bus (+24 V-supply)

Typically 50mA Maximum 70mA

Typically 200mA Maximum 250mA

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C-DIAS ANALOG INPUT MODULE CAI 042

IMPORTANT:

This module exceeds the standard current consumption for C-DIAS modules!

(+5V: 150mA and +24V: 150mA)

If this C-DIAS module is mounted on an 8x module carrier (CMB 08x), the total current of

the modules used must be determined and tested.

The specification for the current consumption is found in the technical document of the

respective module under “Electrical Requirements”

The total current of the +5V supply cannot exceed 1.2A (150mA/slot).

This also applies to the total current of the +24V supply, which also cannot exceed

1.2A (150mA/slot).

IMPORTANT:

La consommation de courant de ce module dépasse les valeurs typiques pour les modules

C-DIAS!

(+5 V: 150 mA et +24 V: 150mA)

Si ce module C-DIAS est monté sur un fond de panier de taille 8 (CMB 08x), le courant total

des modules utilisés doit être déterminé et vérifié.

Les données de la consommation de courant sont mentionnées dans la documentation

technique du module respectif dans le paragraphe "Spécifications électriques"

Le courant total de l'alimentation +5 V ne peut pas dépasser 1,2A (150mA/module).

Cela vaut également pour le courant total de l'alimentation +24 V, lequel ne peut également

pas dépasser 1,2A (150mA/module).

Miscellaneous

Article number 12-009-042
Hardware version 1.x
Standardization UL (E247993)

Environmental conditions

Storage temperature -20 – +85°C
Operating temperature 0 – +40°C
Humidity 0 – 95%, uncondensed
EMV stability Per EN 61000-6-2 (Industrial area)
Shock resistance EN 60068-2-27 150m/s²
Protection type EN 60529 IP 20

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C-DIAS ANALOG INPUT MODULE CAI 042

Mechanical Dimensions

109,2

104,10 (Measurement incl. Cover)

129

24,90

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C-DIAS ANALOG INPUT MODULE CAI 042

Terminal Assignment

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C-DIAS ANALOG INPUT MODULE CAI 042

X1: Measurement bridge 1

Pin Function

1 Signal input 1­2 Signal input 1+
3 Reference Input 1­4 Reference Input 1+
5 Reference Output 1- (GND)
6 Reference Output 1+
7 Reference Output 1- (GND)
8 Reference Output 1+
9 Earth connection 1 (shield)

10 Earth connection 1 (Shield)

X2: Measurement bridge 2

X3: Measurement bridge 3

Pin Function

1 Signal input 2­2 Signal input 2+
3 Reference Input 2­4 Reference Input 2+
5 Reference Output 2- (GND)
6 Reference Output 2+
7 Reference Output 2- (GND)
8 Reference Output 2+
9 Earth connection 2 (Shield)

10 Earth connection 2 (Shield)

Pin Function

1 Signal input 3­2 Signal input 3+
3 Reference Input 3­4 Reference Input 3+
5 Reference Output 3- (GND)
6 Reference Output 3+
7 Reference Output 3- (GND)
8 Reference Output 3+
9 Earth connection 3 (Shield)

10 Earth connection 3 (Shield)

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C-DIAS ANALOG INPUT MODULE CAI 042

X4: Measurement bridge 4

Pin Function

1 Signal input 4­2 Signal input 4+
3 Reference Input 4­4 Reference Input 4+
5 Reference Output 4- (GND)
6 Reference Output 4+
7 Reference Output 4- (GND)
8 Reference Output 4+
9 Earth connection 4 (Shield)

10 Earth connection 4 (Shield)

X5: Serial interface

Pin Function

1 +5 V
2 Rx / TTL
3 Tx / TTL
4 ­5 GND
6 -

The signals of the serial interfaces are TTL signals. To connect the serial interface to a
RS232 interface a TTL/RS232 converter is necessary.

Applicable Connector
X1 – X4: 10-pin. Weidmüller connector B2L3,5/10

X5: 6-pin socket board RM2,54 (not included in connector set CKL 042!)

The complete C-DIAS connector set CKL 045 with spring terminals is available from

SIGMATEK under the article number 12-600-045

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C-DIAS ANALOG INPUT MODULE CAI 042

Status Display

LED Nr. LED color Description

1 Green Output 1 DC OK
2 Green Output 2 DATA

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C-DIAS ANALOG INPUT MODULE CAI 042

Wiring Guidelines

General

The 0V connection for the voltage supply must be wired to the 0V collection point over the
shortest route possible.

Wiring and Cable Shielding

The analog signals received by the module are very small in comparison to the digital
signals. To ensure error-free operation, a careful wiring method should be followed.

The analog connection lines must be as short as possible and avoid parallel wiring with
digital signal lines.

The signal lines should be shielded or at the very least, twisted (see below).

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C-DIAS ANALOG INPUT MODULE CAI 042

Wiring Variations

There are two connection types available for measuring with the resistive wire strain:

• 4-wire measurement:
cable can be used for the DMS; however, the voltage drop on the circuit for the
bridge supply voltage cannot be compensated.

The advantage of this variation is that a four-pole connection

Weidmüller

Plug

• 6-wire measurement:
through direct measurement of the bridge supply voltage on the DMS.

Weidmüller

Plug

Jumper

Line

R

Line

R

R

Line

Shielding

This method has the advantage of voltage compensation

Measuring

Bridge

Line

Shielding

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R

DMS-Measuring

Bridge

C-DIAS ANALOG INPUT MODULE CAI 042

Analysis of the serial interface with Hyper terminal

Settings:

Baud rate: 115,2k
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None

Counter: Shows how often measuring values are written to the serial

interface. The measuring values are updated in about 13ms
intervals. After each reset the counter reading is reset.

Filter 1: This value corresponds to the filtered measurement value of the

voltage on the resistor measuring bridge with 18-bit resolution.
Filter frequency: f

= f

Samp

/ 96

g

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C-DIAS ANALOG INPUT MODULE CAI 042

Filter 2: This value corresponds to the filtered measurement value of the

voltage on the resistor measuring bridge with 18-bit resolution.
Filter frequency: f

= f

g

/ x; x … [8, 16, 32, 64]

Samp

The setting of the filter frequency for filter 2 takes place with the
configuration register of the respective channel.
The description of the configuration register can be found under
Configuration register for Channel x – CFGRx.

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C-DIAS ANALOG INPUT MODULE CAI 042

Communication (CDIAS)

Over the C-DIAS bus, the operating parameters and data can be read and written. Up to
256, 8-bit addresses can be accessed. The data transfer is divided it two register groups.

• Status, instruction and configuration registers.

• Data registers

Note:

Registers not mentioned below cannot be used as they are used by the CAI042

internally.

Remarque:

Registres exploités par la CAI042 en interne ne sont pas mentionnés ci-dessous et

ne peuvent pas être utilisés.

Data over the hardware can be read from the serial EEProm (LASAL EEProm) can be read.

Status, instruction and configuration registers

These registers can be addressed directly.

Data registers

To avoid bus conflicts between the controller and C-DIAS bus with 32-bit data transfers, the
data are stored in 2 pages. A flag in STATUSR always points to the page with the most
current values.

Process for Reading Data from the C-DIAS Bus

The control reads the PAGE bit in STATUSR. If this bit is cleared, the current data is stored
in PAGE0. If the bit is set, the current data is in PAGE1. Data can be read from the actual
page.

Process for Writing Data from the CAI 042 µC

The µC reads the PAGE bit in STATUSR. If it is cleared, the data is written to PAGE1. If the
PAGE bit is set, the data is written to PAGE0. The PAGE BIT is then inverted.

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C-DIAS ANALOG INPUT MODULE CAI 042

Schematic Process Diagram of Communication over the C-DIAS bus

Data is read from PAGE0

µC of

CAI042

Module writes

to PAGE1

0

PAGE Bit in

STATUSR

Data register

PAGE0

Data register

PAGE1

Control reads

Page indentification

control reads

from PAGE0

C-DIAS

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C-DIAS ANALOG INPUT MODULE CAI 042

Data is read from PAGE1

Control reads

Page identification

µC der

Module writes

to PAGE0

1

PAGE Bit in

STATUSR

Data register

PAGE0

C-DIAS

CAI042

Control reads

Data register

PAGE1

from PAGE1

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C-DIAS ANALOG INPUT MODULE CAI 042

Registers used in Communication over the C-Dias bus

Register overview

Register Description Address

STATUSR Module status (error messages, operating status) 0x00
CMDR Instruction register (operating mode settings) 0x01
CFG Global configurations register 0x02

VER Firmware version 0x04 – 0x06

CFGR1 Configuration for channel 1 0x10
CFGR2 Configuration for channel 2 0x11
CFGR3 Configuration for channel 3 0x12
CFGR4 Configuration for channel 4 0x13

SR1 Error status for channel 1 0x18
SR2 Error status for channel 2 0x19
SR3 Error status for channel 3 0x1A
SR4 Error status for channel 4 0x1B

DATA1_P0_F1 Data for filter output 1 Channel1 Page 0 0x20 – 0x23
DATA1_P0_F2 Data for filter output 2 Channel1 Page 0 0x24 – 0x27
DATA2_P0_F1 Data for filter output 1 Channel2 Page 0 0x28 – 0x2B
DATA2_P0_F2 Data for filter output 2 Channel2 Page 0 0x2C – 0x2F
DATA3_P0_F1 Data for filter output 1 Channel3 Page 0 0x30 – 0x33
DATA3_P0_F2 Data for filter output 2 Channel3 Page 0 0x34 – 0x37
DATA4_P0_F1 Data for filter output 1 Channel4 Page 0 0x38 – 0x3B
DATA4_P0_F2 Data for filter output 2 Channel4 Page 0 0x3C – 0x3F

DATA1_P1_F1 Data for filter output 1 Channel1 Page 1 0x40 – 0x43
DATA1_P1_F2 Data for filter output 2 Channel1 Page 1 0x44 – 0x47
DATA2_P1_F1 Data for filter output 1 Channel2 Page 1 0x48 – 0x4B
DATA2_P1_F2 Data for filter output 2 Channel2 Page 1 0x4C – 0x4F
DATA3_P1_F1 Data for filter output 1 Channel3 Page 1 0x50 – 0x53
DATA3_P1_F2 Data for filter output 2 Channel3 Page 1 0x54 – 0x57
DATA4_P1_F1 Data for filter output 1 Channel4 Page 1 0x58 – 0x5B
DATA4_P1_F2 Data for filter output 2 Channel4 Page 1 0x5C – 0x5F

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C-DIAS ANALOG INPUT MODULE CAI 042

Status Register – STATUSR

Bit 7 6 5 4 3 2 1 0
STAUSR MOD3 MOD2 MOD1 MOD0 ERR - - PAGE
R/W R R R R R R R R

Initial Value 0 0 0 0 0 0 0 0

• BIT 7 – MOD3: Modus Bit 3

See Mode bits table.

• BIT 6 – MOD2: Modus Bit 2

See Mode bits table.

• BIT 5 – MOD1: Modus Bit 1

See Mode bits table.

• BIT 4 – MOD0: Modus Bit 0

See Mode bits table.

• BIT 3 – ERR: Error Bit

When this bit is set, an error has occurred. The error register should be checked.

• BIT 0 – PAGE: Page

If this bit is cleared, the last valid data is stored in the address range 0x20 to 0x3F.
If it is set, the last valid data is stored in the address range 0x40 to 0x5F.

This flag is valid only in connection with the RDY bit.

Mode bits table

MOD3 MOD2 MOD1 MOD0 Description

0 0 0 0 Warm-up phase

The module is in the warm-up phase. The data registers
contain no valid data and no instruction can be sent
except for the configuration mode.

0 0 0 1 Operating mode

The module is in operating mode. The data registers
now contain valid data.

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C-DIAS ANALOG INPUT MODULE CAI 042

Instruction Register - CMDR

Bit 7 6 5 4 3 2 1 0
CMDR CMDR[7..0]
R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Instruction register for controlling the module.
The module is set to 0 after this instruction is executed.

Table of instructions

Value Instruction

0x01 Normal operation

(Skip warm-up phase)

0x02 Assume and save configurations

Global Configurations Register – CFG

Bit 7 6 5 4 3 2 1 0
CFG CHAN1 CHAN0
R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Global Configuration of CAI042

• BIT1 – CHAN1 Channel configuration bit

• BIT0 – CHAN0 Channel configuration bit

With the CHAN1:CHAN0 bits, it is possible to select 1, 2 and 4-channel operation. The
conversion time changes according to the settings.

CHAN1 CHAN0 Number of channels (active

channels)

0 0 1 (connector X1) 4ms
0 1 2 (connector X1 & X2) 8ms
1 0 4 (connector X1, X2, X3 & X4) 14ms

Conversion time for all channels

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C-DIAS ANALOG INPUT MODULE CAI 042

VER –Version register

Bit 7 6 5 4 3 2 1 0
VER0 VER[7..0]
VER1 VER[15..8]
VER2 VER[23..16]
R/W R R R R R R R R

Version number of the Firmware:

• VER[7..0] Revision number (binary)

• VER[15..8] Subversion number (binary)

• VER[24..16] Main version number (binary)

Example:

VER2 VER1 VER0 Version

1 9 14 V01.09.14

Configuration register for Channel x – CFGRx

Bit 7 6 5 4 3 2 1 0

CFGRx EN - - - - - FIL1 FIL0

R/W

Initial Value 1 0 0 0 0 0 0 0

x...[1..4]

• BIT7-EN: Enable

The channel is active when this bit is set and inactive when cleared.

• BIT1-FIL1: Filter selection for filter 2

See filter table

• BIT0-FIL0: Filter selection for 2

See filter table

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C-DIAS ANALOG INPUT MODULE CAI 042

Filter table

FIL1 FIL0 Filter frequency for Filter 2

0 0 fg = f
0 1 fg = f
1 0 fg = f
1 1 fg = f

/ 8 Filter 2-1

Samp

/ 16 Filter 2-2

Samp

/ 32 Filter 2-3

Samp

/ 64 Filter 2-4

Samp

Filter 1 (fixed value filter) has a filter frequency of

fg = f

Samp

/ 96.

Status register for Channel x – SRx

Bit 7 6 5 4 3 2 1 0
SRx - - - - - - - SIGOF
R/W R R R

Initial Value 0 0 0 0 0 0 0 0

x ... [1..4]

• BIT 0 – SIGOV: Signal Overflow

If this bit is set, the measured value of the input signal is too high.
When cleared, the measured value is within range.

Data Register - DATAx_Py

Bit 7 6 5 4 3 2 1 0

DATAx_Py_Fz DATAx_Py_Fz [7..0]
DATAx_Py_Fz DATAx_Py_Fz [15..8]
DATAx_Py_Fz DATAx_Py_Fz [23..16]
DATAx_Py_Fz DATAx_Py_Fz [31..24]

R/W R R R R R R R R

Initial Value 0 0 0 0 0 0 0 0

x ... [1 … 4], y ... [0, 1], z ... [1, 2]
32 Bit Data register for channel x, page y and filter z.

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C-DIAS ANALOG INPUT MODULE CAI 042

LASAL EEProm Data

Calibration data CAI042 (24C02 is organized by byte):

Address Data Description

$00 $xx Check sum
$01 123 Identification
$02 5 Module group 5=CAI
$03 4 Module version 4=CAI042
$04 4 Number of channels
$05 10 Hardware version $10=HW 1.0

$06-$3F 0 FILL

$10 Serial number

AI calibration data

$40 $xxxx Check sum
$42 12345 Identification
$44 9 Length of the following data block in WORD

$46 4 Number of channels
$48-$57 „xxxxxx“ Serial number as 16-byte string. E.G .: „31333_01_0019___“
$58-$AF 0 FILL
$B0-$B3 xxx* Head1 (CalibrateCounter)
$B4-$B7 xxx* Head1 (ZeroLevel)

$B8-$BB xxx* Head1 (CalibrateLevel)
$BC-$BF xxx* Head1 (CalibrateWeight)
$C0-$C3 xxx* Head1 (MaxWeight)
$C4-$D7 xxx* Head2 (partitioned the same as Head1)
$D8-$EB xxx* Head3 (partitioned the same as Head1)
$EC-$FF xxx* Head4 (partitioned the same as Head1)

* Customer specific data (not require for the operating of the module).

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