550 725 02

Analogue Input channel (ch 1 - 4) (PD 642 mV/Thermocouple)

Registers in Analogue I/O channel.

RegNo	Identifier	Memory type	Read Out	Type
0	AnalogIn	RAM Read Write	Decimal	Real
1
2
3
4
5
6
7	OffsetTemp	RAM Init EEPROM	-------	Real
8	Levels	RAM Init EEPROM	-------	Record
9	ChConfig	EEPROM RPW	-------	Record
10	FilterConstant	EEPROM RPW	Decimal	Real
11	Span	EEPROM RPW	Decimal	Real
12	Zeropoint	EEPROM RPW	Decimal	Real
13
14	Guid	PROM Read only	-------	String
15	ChError	RAM Read Write	Binary	Record

RegNo 0: AnalogIn

AnalogIn:

Real;

This variable holds the measurement result of the input as a voltage or thermocouple signal.

Voltage:	AnalogIn holds the measurement result of the voltage input, as a scaled value in SI units, according to the contents of Span and Zeropoint
Thermocouple:	AnalogIn holds the measurement result of the temperature in ºC, scaled according to the contents of OffsetTemp and ZeroPoint.

If the value should attempt to exceed 110% of fullscale, the contents of this register will be held at 110% of fullscale and the device will generate an error code. A similar situation occurs if the input signal attempts to drop below – 5%.

Act error in the P-NET response is set on access to AnalogIn if one of the following bits in ChError.Act is set: 0, 1, 4, 5, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19 or 20.

RegNo 7: OffsetTemp

		(* Factory setting *)
OffsetTemp:	Real;	(* 20.0 *)

OffsetTemp is used to dynamically auto compensate for the temperature at the sensor cable / installation cable junction.

OffsetTemp has only effect when the ChConfig.SignalType is set for a thermocouple input signal.

RegNo 8: Levels

Record			(* Factory setting *)
	Level1:	Real;	(* 0 *)
	Level2:	Real;	(* 0 *)
	DeltaLevel:	Real;	(* 0 *)
End;

Levels can be used as a kind of limit switch, and a notification can be connected. See also ChConfig.EnableNotification.

RegNo 9: ChConfig

The ChConfig variable is a record of the following type:

Record			(* Factory setting *)
	EnableFunctions:	Bit8;	(* 0 *)
	SignalType:	Byte;	(* 0 *)
	EnableNotification:	Bit8;	(* 0 *)
	User:	Byte;	(* 0 *)
End;

EnableFunctions:

7	0
		0: Simulation
		1:
		2: Act_data_error_on_AnalogIn_higher_than_Level1
		3: Act_data_error_on_AnalogIn_lower_than_Level1
		4: Act_data_error_on_AnalogIn_higher_than_Level2
		5: Act_data_error_on_AnalogIn_lower_than_Level2
		6:
		7:

Bit 0:           Simulation.

When Simulation is set no measurement will be calculated, and it is possible for the user to insert any value in AnalogIn. If the channel is configured as an output, AnalogIn will follow the AnalogSetpointScaled Setpoint value.

The following enable bits enable “Act data error” in the P-NET response.

Bit 2:           Act_data_error_on_AnalogIn_higher_than_Level1.

Bit 3:           Act_data_error_on_AnalogIn_lower_than_Level1.

Bit 4:           Act_data_error_on_AnalogIn_higher_than_Level2.

Bit 5:           Act_data_error_on_AnalogIn_lower_than_Level2.

SignalType:
		0	=>	Voltage input 0-100 mV
	The following SignalType settings specify the type of Thermocouple transducer:
		1	=>	Type R. Platinum-13% Rhodium/Platinum (-50 C – 1768 C)
		2	=>	Type S. Platinum-10% Rhodium/Platinum (-50 C – 1768 C)
		3	=>	Type B. Platinum-30% Rhodium/Platinum (0 C – 1820 C)
		4	=>	Type J. Iron/Copper-Nickel (-109.1 C – 1200 C)
		5	=>	Type T. Copper/Copper-Nickel (-166.5 C – 400 C)
		6	=>	Type E. Nickel-Chromium/Copper-Nickel (-94.8 C – 1000 C)
		7	=>	Type K. Nickel-Chromium/Nickel-Aluminium (-153.7 C – 1372 C)
		8	=>	Type N. Nickel-Chromium-Silicon/Nickel-Silicon (-270 C – 1300 C)
		9	=>	Channel disabled

EnableNotification:

Notification can be enabled for the following events:

7	0
		0: Change_in_ChError.Act
		1:
		2: Increasing_AnalogIn_crossing_Level1
		3: Decreasing_AnalogIn_crossing_Level1
		4: Increasing_AnalogIn_crossing_Level2
		5: Decreasing_AnalogIn_crossing_Level2
		6: AnalogIn_changed_Delta_level
		7:

Bit 0:  Change_in_ChError.Act.

Bit 2:  Increasing_AnalogIn_crossing_Level1.

Bit 3:  Decreasing_AnalogIn_crossing_Level1.

Bit 4:  Increasing_AnalogIn_crossing_Level2.

Bit 5:  Decreasing_AnalogIn_crossing_Level2.

Bit 6:  AnalogIn_changed_Delta_level

Enable notification on |AnalogIn – Old AnalogIn| > Levels.DeltaLevel. AnalogIn is copied to Old AnalogIn when Notification is set.

A bit in the Notification register in the Service Channel will be set if the condition described for any bit that is set in this EnableNotification field has been met. The Notification bit number in the Service Channel register will correspond with the channel number that detected the condition.

RegNo 10: FilterConstant

FilterConstant:

Real;

(* Factory setting = 0 *)

This variable selects a time constant for the input filter. The filter time constant defines that for a stepped change at the input terminals, the measured value (AnalogIn), will have changed by 63% of its target value, at the end of the specified time period.

Only FilterConstants > 3 and < 50 sec will activate the filter.

RegNo 11: Span

Span:

Real;

(* Factory setting = 100 *)

The span for the connected transmitter must be inserted in this variable. Span is not used for thermocouple signals.

RegNo 12: Zeropoint