Scaime eNod3-C User manual

eNod3-C
Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
1/22
User’s instructions

eNod3-C
Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
2/22
Document revisions
version date description
A 01/07 -creation
B 05/07 -layout modification
C 11/07 -CANopen® protocol comatibility / RS/CAN jumper
D 02/08 -CANopen® communication full description
-checkweigher statistical datas presentation
E 04/08 -new inputs assignement : allow new cycle and peak
detection cycle decription modified
F 11/08
-document title modified (eNod3 => eNod3-C)
-band-stop filter and automatic zero correction in
checkweigher descriptions added.
G 09/09
-new hardware design
-logical inputs wiring examples
-instructions for use in legal for trade applications
added.
H 11/09 -document title modified
-reference to a use in an AWI
I 07/11
-Determination of the weight : Checkweigher result
quality value added
-checkweigher zero automatic correction;

eNod3-C
Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
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1GENERAL PRESENTATION:.............................................................................. 4
1.1 Dimensions: ..................................................................................................................................... 4
1.2 General characteristics: ................................................................................................................... 5
2INTERFACES: ..................................................................................................... 7
2.1 Connection to the power supply: ..................................................................................................... 7
2.2 Connection to load cell(s): ............................................................................................................... 7
2.3 Connection of Inputs & Outputs:...................................................................................................... 8
2.3.1 Digital inputs .......................................................................................................................... 8
2.3.2 Digital outputs........................................................................................................................ 8
2.4 COMMUNICATION INTERFACES:................................................................................................. 9
3COMMUNICATION:............................................................................................. 9
3.1 ModBus RTU: ................................................................................................................................ 10
3.2 SCMBus:........................................................................................................................................ 10
3.2.1 Fast SCMBus format: .......................................................................................................... 10
3.3 CANopen®..................................................................................................................................... 10
4USE IN LEGAL FOR TRADE APPLICATIONS :............................................... 11
4.1 Introduction .................................................................................................................................... 11
4.2 Legal for trade parameters ............................................................................................................ 11
4.3 Sealing ........................................................................................................................................... 11
4.3.1 Physical sealing :................................................................................................................. 11
4.3.2 Software sealing :................................................................................................................ 11
4.4 Specific requirements : .................................................................................................................. 11
5CALIBRATION................................................................................................... 12
5.1 Calibration types: ........................................................................................................................... 12
5.2 Linearization correction:................................................................................................................. 12
6INPUTS FUNCTIONING: ................................................................................... 13
6.1 Assignment of inputs: .................................................................................................................... 13
6.2 General functions:.......................................................................................................................... 13
6.3 Functions attached to an operating mode: .................................................................................... 13
7OUTPUTS FUNCTIONING: ............................................................................... 14
7.1 Assignment of outputs: .................................................................................................................. 14
7.2 General functions:.......................................................................................................................... 14
7.3 Functions attached to an operating mode: .................................................................................... 14
8SET POINTS:..................................................................................................... 15
9FILTERS: ........................................................................................................... 16
10 TRANSMITTER OPERATING MODE:............................................................ 17
10.1 Measurement reading request:...................................................................................................... 17
10.1.1 Single measurement transmission: ..................................................................................... 17
10.1.2 Continuous measurement transmission: ............................................................................. 17
10.2 Specific commands through an input:............................................................................................ 17
10.2.1 Transmit measurement (fig. 4) ............................................................................................ 17
10.2.2 Measurement window (fig.5) ............................................................................................... 17
10.2.3 Clear .................................................................................................................................... 17
11 CHECKWEIGHER OPERATING MODE:........................................................ 17
11.1 Determination of the weight: .......................................................................................................... 18
11.2 Providing the result value : ............................................................................................................ 19
11.2.1 Outputs synchronization:..................................................................................................... 19
11.2.2 With the SCMBus protocol: ................................................................................................. 19
11.2.3 With the ModBus protocol: .................................................................................................. 19
11.2.4 With the CANopen® protocol: ............................................................................................. 19
11.3 Management of Set-points:............................................................................................................ 19
11.4 Dynamic zero ................................................................................................................................. 20
11.5 Checkweigher zero automatic correction ...................................................................................... 20
12 PEAK CONTROL OPERATING MODE:......................................................... 21
12.1 Non-triggered operating mode:...................................................................................................... 21
12.2 Triggered operating mode: ............................................................................................................ 21
12.3 Management of Set-points:............................................................................................................ 22
12.4 Other possible outputs assignments:............................................................................................. 22

eNod3-C
Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
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1 GENERAL PRESENTATION:
eNod3-C provides an economic high performance solution to transform any strain gauge sensor
into an intelligent digital system. eNod3-Cincludes three advanced operating modes for control of
static and dynamic processes:
-Measurement transmitter.
-Checkweigher.
-Peak control.
eNod3-Cis provided with RS485/422, RS232 and CANbus outputs supporting the ModBus-RTU,
SCMBus and CANopen® protocols. Each module is provided with 2 logical inputs and 2 logical
outputs, authorizing synchronization of functions with automation and alarm management.
SCAIME provides the eNodView software to facilitate installation of eNod3-Cto set parameters
and calibrate the measurement system, for acquisition of measurements and simulation of digital
filters.
1.1 Dimensions:
With waterproof housing version a connecting cable with a shield grounded on both sides should
be used to connect peripheral devices and eNod3.
Cable gland is provided with an inside contact spring for an easy and safe EMC connection of
shield cable and housing.
Single board card Waterproof
housing version
DIN rail version

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Digital Transmitter
eNod3-C: User’s instructions
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1.2 General characteristics:
Power supply Unit
power supply voltage 10 ..... 28 VDC
max consumption 70 with 350Ωload cell
120 with 80Ωload cell mA
Temperature range
storage temperature -25...+85 °C
operating temperature -10...+40 °C
Load cell
impedance (complete bridge) > 80 Ω
connection 4 or 6 wires
load cell power supply 5 ± 5% VDC
Communication
RS232
RS 485/422 Half or full-duplex
RS baud rate 9600 ... 115200 bauds
Can 2.0A 20....1000 kbauds
Logical inputs
number 2
type optocoupler
low-level voltage 0 ..... 3 VDC
high-level voltage 9 .... 28 VDC
current at high level 10mA @ 24V mA
insulation voltage 2500 Vrms
Logical outputs
number 2
type opto-insulated static relays
max current @ 40°C 0.4 A
max voltage in open state 55 V
resistance in ON state 2 Ω
insulation voltage 2500 Vrms
Metrological characteristics
analog input signal range 7.8 ... 500 mV/V
typical temperature offset drift @ input
signal range <7,8 mV/V 1.5 ppm/°C
typical slope temperature effect 2 ppm/°C
max linearity error 0.003 %
A/D conversion rate 1920 .... 6.25 meas./s
Legal for use metrological characteristics
Class III or IIII
Maximum number of verification scale
divisions
6000 for class III
1000 for class IIII
Minimum voltage division per verification
scale division (∆Umin) 0.5 µV
Maximum voltage for weighing range 39 mV
Minimum impedance for the load-cell 80 Ω
Maximum impedance for the load-cell 1500 Ω
Value of factor Pi0.5

eNod3-C
Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
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Programmable functions
acquisition of zero, taring, zero tracking
physical or theoretical calibration
slope correction
non-linearity polynomial correction
low-pass, band-stop and self-adaptive digital filters
set points management
checkweigher functioning mode
peak detection functioning mode

eNod3-C
Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
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2 INTERFACES:
2.1 Connection to the power supply:
The ‘POWER’ light shows whether or not the power supply is connected.
2.2 Connection to load cell(s):
eNod3-Csupplies power to the load cells (5 VDC).
Up to four 350Ωload cells can be connected in parallel.
eNod3-Callows the use of 4- or 6- wire load cells.
-4-wire load cells: jumpers in place.
-6-wire load cells: jumpers removed.
Power supply
10 to 28VDC PWR+
PWRREF
POWER
_
+
2
1
4/6- wire jumpers
ON : 4 wires
OFF : 6 wires
Exc+
Sens+
Exc-
Sens-
Sig+
Sig-
Shield
1
2
3
4
5
6
7

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Digital Transmitter
eNod3-C: User’s instructions
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2.3 Connection of Inputs & Outputs:
2.3.1 Digital inputs
connection to a detector :
connection to a push button (PB) :
2.3.2 Digital outputs
Output characteristics (opto-insulated static relays)
Max current @ 40°C 0.4A
Max voltage in the open state 55V
Resistance in the ON state 2 Ω
Insulation voltage 2500 Vrms
A light is assigned to each output.
Characteristics of opto-insulated Inputs
High level 9 - 28VDC consumption 10mA @ 24VDC
Low level 0 to 3 VDC
NC
NC
OUT 2
OUT 1
OUTCOM
IN 2 –
IN 2 +
IN 1 –
IN 1 +
1
8
9
7
6
5
4
3
2

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Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
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2.4 COMMUNICATION INTERFACES:
eNod3-Cis capable of communicating with an automatic control for each connection:
The connection to the RS 485 / RS 422 interface is made through TA, TB and RA, RB connections on the 9-
pins connector. (TA = direct transmission, TB = inverse transmission, RA = direct reception, RB = inverse
reception).
For an RS485 (half duplex) communication, just connect the TB and TA pins and remove the corresponding
jumper (OFF).
For an RS422 or RS485 full-duplex communication, use the four TB, TA, RB and RA pins. The corresponding
jumper must be in place (ON) (which is the default case on delivery).
The RS232 interface is connected using Tx, Rx and REF connections on the 9-pin connector.
The CAN interface is connected using the CANH, CANL and REF (not mandatory) connections on the 9-pin
connector.
3 COMMUNICATION:
jumper CAN/RS ON
-RS485/422
-RS232
-CAN jumper CAN/RS OFF
+
-
55 VDC max
OUTCOM
OUT
Load
+
-
55 VDC max
OUTCOM
OUT
Load
OUTCOM
OUT
Load
38 VAC max
RS485 jumper
ON : Full duplex
OFF : Half duplex
CAN / RS jumper
ON : RS
OFF : CAN
TB
TA
RB
RA
Rx
TX
REF
CANL
CANH
RS232 CAN
RS485
Half/Full
communication
9
7
6
5
4
3
2
1
8

eNod3-C
Digital Transmitter
eNod3-C: User’s instructions
NU-eNod3C-E-0911_165702-I
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eNod3-Ccan communicate using several protocols:
- ModBus RTU
- SCMBus standard format or fast format.
- CANopen®
Switching from the SCMBus protocol to the ModBus-RTU protocol (and reciprocally) can be
done by software programmation.
1) send the corresponding command
2) send the ‘storage in EEPROM’ command
3) reset (hardware or software)the device
See example describing how to switch from ModBus-RTU to SCMBus protocol in the
document SCMBUS communication Ref 165 706 Appendix A.
Switching from SCMBus/ModBus-RTU protocol to CANopen® protocol (and reciprocally)
can be done by setting or removing the appropriate jumper (cf. §3) then by making a reset
3.1 ModBus RTU:
See the description of the frames and functions in the ‘ModBus RTU communication protocol’ Ref.
165 704 document.
3.2 SCMBus:
See the description of the frames and functions in the ‘SCMBus communication protocol’ Ref.
165 706 document.
The SCMBus protocol has got similarities with ModBus-RTU. It is based on the master/slave
structure however it allows to transmit measurements continuously without collision management
on the line. This operating mode is only available in transmitter functioning mode.
The measurements transmission frequency depends on the serial baud rate thus transmitting 100
meas/s is impossible at less than 19200 bauds. For fast measurement transmissions, use the fast
SCMBus format with wich 1200 meas/s can be expected at 115200 bauds.
Other methods of transmitting information without any master request :
-transmitter mode : measurement transmission triggered by a digital input.
-whatever the functioning mode is, physical calibration procedure : automatic
transmission when a step in the process is complete.
3.2.1 Fast SCMBus format:
The Fast SCMBus format is particularly useful for measurement acquisitions at the highest
frequency, for example, in order to analyse dynamic phenomena.
This format should only be used for point-to-point operation in full-duplex.
To optimize the speed, in addition to using the Fast SCMBus format, it is preferable to configure
eNod3-Cfor operation with ‘no processing transmitter’. In this configuration, filters are inactive, set-
points are not managed and there is no polynomial linearization.
3.3 CANopen®
eNod3-Csupports CANopen® communication protocol and is compliant with ‘CIA® Standard
V301’. See the description of the frames and functions in the ‘CANopen® communication protocol’
Ref. 165 717 document.