AKT2G-AN-430-000

4-channel analog input, parameterizable, -10/0…+10 V, -20/0/+4…+20 mA, 16 bit

See Also:

• Single-Ended / Differential Typification
• Dielectric strength
• Temporal Aspects of Analog/Digital Conversion

Related Topics: Map Input and Output to Variables

Configuration of 0/4..20 mA Differential Inputs

This section describes the 0/4..20 mA differential inputs for terminal series AKT2G-AN-430.

For the single-ended 20 mA inputs the terminal series AN-430 they only apply with regard to technical transferability and also for devices whose analog input channels have a common related ground potential (and therefore the channels are not to each other and/or not to power supply electrically isolated). Herewith an example for an electrically isolated device is the terminal AN-430.

Technical Background

The internal input electronics of the terminals referred to above have the following characteristic (see Figure 1: "Internal connection diagram 0/4...20 mA inputs"):

• Differential current measurement, i.e. concrete potential reference is primarily not required. The system limit applies is the individual terminal AN-430.
• Current measurement via a 33 Ω shunt per channel, resulting in a maximum voltage drop of 660 mV via the shunt
• Internal resistor configuration with GND point (A) central to the shunt

  The configuration of the resistors is symmetric, such that the potential of (A) is central relative to the voltage drop via the shunt.

• All channels within the terminal have this GND_int potential in common.
• the common GND_int potential (A)
  • is connected for 1 and 2 channel terminals to a terminal point and not with GND_PC (power contact).
  • is connected for 4 channel terminals with GND_PC
• The center point of the voltage drop over the 33 Ω shunt is referred to common mode point (CMP). According to the technical product data, the maximum permitted UCM voltage (common mode) refers to the potential between the CMP of a channel and the internal GND or the potential between the CMP of 2 channels within a terminal.

  It must not exceed the specified limit (typically ±10 or ±35 V).

Accordingly, for multi-channel measurements U_CM specifications must be followed.

Figure 1: Internal connection diagram 0/4...20 mA inputs

The block diagram for a 2 channel terminal shows the linked GND points within the terminal (Internal connection diagram for 0/4..20 mA inputs of a AKT2G-AN-430):

Figure 2: Internal connection diagram for 0/4..20 mA inputs of a AKT2G-AN-430

For all channels within the terminal U_CM-max must not be exceeded.

• 
  

• U_CM for 0/4..20 mA inputs

  If U_CM of an analog input channel is exceeded, internal equalizing currents result in erroneous measurements.

  For 1 and 2 channel terminals the internal GND is therefore fed out to a terminal point, so that the U_CM specification can be met through application-specific configuration of this GND point, even in cases of atypical sensor configuration.

Summary

• We recommended connecting GND_int with a low-impedance potential, because this significantly improves the measuring accuracy of the AN-430.

  Please note the instructions relating to the U_CM potential reference.

• The U_CM potential reference must be adhered to between CMP ↔ GND_int and CMP_ch(x) ↔ CMP_ch(y).

  If this cannot be guaranteed, the single-channel version should be used.

• Terminal configuration:
  • AN-430: GND is connected with the negative power contact. The external connection should be such that condition 2 is met.

If the sensor cable is shielded, the shield should not be connected with the GND_int terminal point but with a dedicated low-impedance shield point.

• If terminal points of several AN-430 terminals are connected with each other, ensure that condition 2 is met.

• 
  

• Connection of GND_int

  To achieve a precise measurement result GND_int should be connected to a suitable external low-impedance potential, taking account the specifications for U_CM.

  In the AN-430 terminals GND_int is already connected with the negative power contact. Here too the specifications for U_CM must be followed.

CoE Object Description and Parameterization

Restore Object

Index 1011 Restore default parameters

Index (hex)	Name	Meaning	Data type	Flags	Default
1011:0	Restore default parameters	Restore default parameters	UINT8	RO	0x01 (1dec)
1011:01	SubIndex 001	If this object is set to “0x64616F6C” in the set value dialog, all backup objects are reset to their delivery state.	UINT32	RW	0x00000000 (0dec)

Configuration Data

Index 80n0*** AI settings (for 0 ≤ n ≤ 3)

Index (hex)	Name	Meaning	Data type	Flags	Default
80n0:0	AI Settings	Maximum subindex	UINT8	RO	0x18 (24dec)
80n0:01	Enable user scale	User scale is active.	BOOLEAN	RW	0x00 (0dec)
80n0:02	Presentation	Signed presentation Unsigned presentation Absolute value with MSB as sign Signed amount representation	BIT3	RW	0x00 (0dec)
80n0:05	Siemens bits	The S5 bits are displayed in the three low-order bits	BOOLEAN	RW	0x00 (0dec)
80n0:06	Enable filter	Enable filter, which makes PLC-cycle-synchronous data exchange unnecessary	BOOLEAN	RW	0x00 (0dec)
80n0:07	Enable limit 1	Limit 1 enabled	BOOLEAN	RW	0x00 (0dec)
80n0:08	Enable limit 2	Limit 2 enabled	BOOLEAN	RW	0x00 (0dec)
80n0:0A	Enable user calibration	Enabling of the user calibration	BOOLEAN	RW	0x00 (0dec)
80n0:0B	Enable vendor calibration	Enabling of the vendor calibration	BOOLEAN	RW	0x01 (1dec)
80n0:0E	Swap limit bits	Changing of the Limit Bits	BOOLEAN	RW	0x00 (0dec)
80n0:11	User scale offset	User scaling offset	INT16	RW	0x0000 (0dec)
80n0:12	User scale gain	User scaling gain. The gain is represented in fixed-point format, with the factor 2-16. The value 1 corresponds to 65536dec (0x00010000) and is limited to ±0x7FFFF	INT32	RW	0x00010000 (65536dec)
80n0:13	Limit 1	First limit value for setting the status bits	INT16	RW	0x0000 (0dec)
80n0:14	Limit 2	Second limit value for setting the status bits	INT16	RW	0x0000 (0dec)
80n0:15	Filter settings	This object determines the digital filter settings, if it is active via Enable filter (index 0x80n0:06). The possible settings are sequentially numbered. 50 Hz FIR 60 Hz FIR IIR 1 IIR 2 IIR 3 IIR 4 IIR 5 IIR 6 IIR 7 IIR 8	UINT16	RW	0x0000 (0dec)
80n0:17	User calibration offset	User offset compensation	INT16	RW	0x0000 (0dec)
80n0:18	User calibration gain	User calibration gain	INT16	RW	0x4000 (16384dec)

• 
  

• The filter characteristics are set via index 0x8000:15 (see "80n0:15")

  The filter frequencies are set for all channels of the AN-430 terminals centrally via index 0x8000:15 (channel 1). All other corresponding indices 0x80n0:15 have no parameterization function!

Index 80nD AI Advanced settings (for 0 ≤ n ≤ 3)

Index (hex)	Name	Meaning		Data type	Flags	Default
80nD:0	AI Advanced Settings	Maximum subindex		UINT8	RO	0x12 (18dec)
80nD:11	Input Type	Measurement mode, allowed values:		UINT16	RW	0x0002 (2dec)
		0x02	-10..+10 V
		0x0E	0..10 V
		0x11	-20..+20 mA
		0x12	0..20 mA
		0x13	4..20 mA
		0x14	4..20 mA (NAMUR)
80nD:12	Scaler	Scaling range, allowed values:		UINT16	RW	0x0000 (0dec)
		0x00	Extended Range
		0x03	0x03 Legacy Range
80nD:17	Low Range Error	Lower threshold for setting the error bit and error led		INT32	RW	Dependent on 80nD:11
80nD:18	High Range Error	Upper threshold for setting the error bit and error led		INT32	RW	Dependent on 80nD:11

Index 80nE*** AI internal data (for 0 ≤ n ≤ 3)

Index (hex)	Name	Meaning	Data type	Flags	Default
80nE:0	AI internal data	Maximum subindex	UINT8	RO	0x01 (1dec)
80nE:01	ADC raw value	ADC raw value	UINT16	RO	-

Index 80nF*** AI vendor data (for 0 ≤ n ≤ 3)

Index (hex)	Name	Meaning	Data type	Flags	Default
80nF:0	AI vendor data	Maximum subindex	UINT8	RO	0x02 (2dec)
80nF:01	Calibration offset	Offset (vendor calibration)	INT16	RW	0x0000 (0dec)
80nF:02	Calibration gain	Gain (vendor calibration)	INT16	RW	0x4000 (16384dec)

Index 80nF AI Vendor data (for 0 ≤ n ≤ 3)

Index (hex)	Name	Meaning	Data type	Flags	Default
80nF:0	AI Vendor data	Maximum subindex	UINT8	RO	0x06 (6dec)
80nF:01	R0 offset	Offset (Vendor calibration)	INT16	RW	0x0000 (0dec)
80nF:02	R0 gain	Gain (Vendor calibration)	INT16	RW	0x4000 (16384dec)
80nF:03	R1 offset	Offset (Vendor calibration)	INT16	RW	0x0000 (0dec)
80nF:04	R1 gain	Gain (Vendor calibration)	INT16	RW	0x4000 (16384dec)
80nF:05	R2 offset	Offset (Vendor calibration)	INT16	RW	0x0000 (0dec)
80nF:06	R2 gain	Gain (Vendor calibration)	INT16	RW	0x4000 (16384dec)

Input Data

Index 60n0*** AI inputs (for 0 ≤ n ≤ 3)

Index (hex)	Name	Meaning	Data type	Flags	Default
60n0:0	AI inputs	Maximum subindex	INT16	RO	0x11 (17dec)
60n0:01	Underrange	Value below measuring range.	BOOLEAN	RO	0x00 (0dec)
60n0:02	Overrange	Measuring range exceeded.	BOOLEAN	RO	0x00 (0dec)
60n0:03	Limit 1	Limit value monitoring Limit 1 not active value is smaller than limit value 1 value is larger than limit value 1 Value is equal to limit value 1	BIT2	RO	0x00 (0dec)
60n0:05	Limit 2	Limit value monitoring limit 2 not active value is smaller than limit value 2 value is larger than limit value 2 Value is equal to limit value 2	BIT2	RO	0x00 (0dec)
60n0:07	Error	The error bit is set if the data is invalid (over-range, under-range)	BOOLEAN	RO	0x00 (0dec)
60n0:0E	Sync error	The Sync error bit is only required for DC mode. It indicates whether a synchronization error has occurred during the previous cycle. This means a SYNC signal was triggered in the AN-430, although no new process data were available (0=OK, 1=NOK).	BOOLEAN	RO	0x00 (0dec)
60n0:0F	TxPDO State	Validity of the data of the associated TxPDO (0 = valid, 1 = invalid).	BOOLEAN	RO	0x00 (0dec)
60n0:10	TxPDO Toggle	The TxPDO toggle is toggled by the slave when the data of the associated TxPDO is updated.	BOOLEAN	RO	0x00 (0dec)
60n0:11	Value	Analog input date	INT16	RO	0x0000 (0dec)

Technical Data

Technical Data		AKT2G-AN-430-000
Analog inputs		4 (U differential, I single-ended)
Conversion type		simultaneous
ADC type		SAR
Signal voltage		-10/0…+10 V
Signal current		-20/0/+4…+20 mA
Measuring range, nominal (Full Scale Value)	Voltage measurement range	-10/0…+10 V
	Current measurement range	-20/0/+4…+20 mA
Measuring range, technical	Voltage measurement range	-10.73…+10.73 V
	Current measurement range	-21.47…+21.47 mA
Measuring error (full measuring range)		< ±0.3 % (relative to full scale value)
Distributed Clocks		yes
Distributed Clocks precision		<< 1 µs
Support NoCoeStorage		yes
Resolution		16 bit (incl. sign)
Internal resistance		Voltage measurement: > 200 kΩ | Current measurement: 85 Ω typ.
Input filter limit frequency		5 kHz
Common-mode voltage UCM		35 V max. (voltage measurement)
Minimal EtherCAT cycle time		200 µs
Overcurrent protection		50 mA typ.
Bit width of the process image		Inputs: 16 Byte
Configuration		no address or configuration settings required
MTBF (+55°C)		-
Special features		U/I parameterisable, Extended Range, standard and compact process image, activatable FIR/IIR filters
Supply voltage for electronic		via the E-bus
Current consumption via E-bus		typ. 170 mA
Electrical isolation		500 V (E bus/ fieldbus voltage)
Recommended operating voltage range (ground related to GND/ 0V power contact)	Voltage measurement range	UCM 35 V max.
	Current measurement range	single ended, dielectric strength max. 30 V
Recommended signal range	Voltage measurement range	Extended Range (107%), differential
	Current measurement range	Extended Range (107%), single ended
Destruction limit (ground related to GND/ 0V power contact)	Voltage measurement range	50 V
	Current measurement range	30 V
Destruction limit (differential)	Voltage measurement range	50 V
	Current measurement range	n.a.
Weight		approx. 65 g
Permissible ambient temperature range during operation		-25…+60 °C
Permissible ambient temperature range during storage		-40…+85 °C
Permissible relative humidity		95 %, no condensation
Design		HD (High Density) housing with signal LED
Dimensions (W x H x D)		approx. 15 mm x 100 mm x 70 mm (width aligned: 12 mm)
Mounting		on 35 mm mounting rail conforms to EN 60715
Vibration/shock resistance		conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission		conforms to EN 61000-6-2/EN 61000-6-4
Protection class		IP20
Installation position		variable
Approval		CE, cULus