AC2220 - Electronic module IFM - Free user manual and instructions

Product type	AS-i slave module for Pt100 temperature sensors
Brand	IFM
Model	AC2220
Power supply	Via AS-i bus (AS-i voltage)
Sensor type	Pt100 2-wire or 4-wire
Measuring range	-200 °C to +850 °C
Resolution	0.1 °C
Number of channels	4 analog channels
AS-i profile	S-7.3.E (according to AS-i specification V2.1)
Conversion time (4 channels)	480 ms
Maximum transmission time (4 channels)	620 ms (conversion + transmission)
Max. number of modules per AS-i strand	31
Addressing	Addresses 1 to 31, factory address 0; addressing via AC1144 unit or E70213 cable
Mounting	On 35 mm profile rail
Actuator connection	Via pluggable connectors (accessories, e.g. E70230)
LED indicators	4 yellow LEDs (I1..I4) for input status, 1 green LED (AS-i), 1 red LED (FAULT)
Mains filter	Selectable 50 Hz or 60 Hz via parameter P0
Peripheral fault configuration	Via bits P1 and P2 to enable/disable fault channels
Maintenance	No specific maintenance required; periodic check of connections recommended
Environmental conditions	Industrial use; standard ambient temperature (refer to full manual)
Approvals	Conforms to AS-i standards (not specified)

Frequently Asked Questions - AC2220 IFM

What is the measuring range of the AC2220 module?

The measuring range is -200 °C to +850 °C, with a resolution of 0.1 °C.

How to address the AC2220 module?

Use the AC1144 addressing unit or the E70213 addressing cable. The factory address is 0, valid addresses are 1 to 31. Do not address while powered.

What do the yellow LEDs I1 to I4 mean?

The yellow LEDs indicate the status of the analog inputs: off = not connected, on = signal within range, flashing = signal out of range or fault.

How to connect a Pt100 2-wire sensor?

Connect the sensor between the + terminal (1+ to 4+) and the corresponding - terminal (1- to 4-). The + terminals are interconnected within the module.

How to connect a Pt100 4-wire sensor?

Connect the sense wires to S+ and S- terminals (for each channel), and the excitation wires to + and - terminals. This improves accuracy by eliminating lead resistances.

How to configure the 50/60 Hz filter?

Parameter P0 allows selection: P0 = 1 enables 50 Hz filter, P0 = 0 enables 60 Hz filter. The 50 Hz filter is used in Europe.

What to do if the red FAULT LED flashes?

A flashing indicates a peripheral fault: at least one analog channel is out of range or not connected. Check the sensors and the configuration of bits P1/P2.

What is the total transmission time for 4 channels?

The conversion time is 480 ms, AS-i transmission takes 140 ms (4 channels × 7 cycles × 5 ms), for a total of approximately 620 ms in the ideal case.

How to choose between 2-wire and 4-wire mode?

Parameter P3 allows selection: P3 = 1 for 2-wire mode, P3 = 0 for 4-wire mode. 4-wire mode is recommended for better accuracy.

Does the module require special maintenance?

No specific maintenance is required. It is recommended to periodically check the connections and clean the device with a dry cloth if necessary.

USER MANUAL AC2220 IFM

Pure geometric diagram of a hexagonal shape with internal lines and corner markers (no text or symbols)

Function and features

The AS-i slave converts analogue signals (temperature values) into digital values and transfers them to the host.

The data transfer is asynchronous according to the AS-i profile S-7.3 and the AS-i specification V2.1.

• Sensor supply from AS-i
• Conversion of measured values for 4 channels: 480ms
• Resolution 0.1°C
• Measuring range -200 .. +850°C
• AS-i profile S-7.3.E
• The actuators are connected via Combicon connectors (accessories, e.g. E70230)
• Connection of 2-wire / 4-wire sensors possible
  • Maximum number of modules per AS-i system: 31

Installation

Fix the module onto a 35mm rail.

25 114 105 35,5 addressing plug Combicon connector with screw terminals (optional)

FE FE FE FE S+ 1+ 1- S- S+ 2+ 2- S- ○○○○ ○○ ○○ S- 3- 3+ S+ S- 4- 4+ S+ A+A-

S+ Sense inputs + *)

S - Sense inputs - *)

1+ ... 4+ Drive outputs +

1 - ... 4 - Drive outputs -

FE functional earth

*) only for 4-wire Pt100

A+ AS-i +

A-AS-i-

LEDs I1 ... I4 yellow Status analogue

inputs 1... 4

LED green AS-i voltage

LED red FAULT

Addressing

Assign a free address between 1 and 31. The address set at the factory is 0.

Address the slave using the AC1144 addressing unit.

When mounted and wired the module can be addressed with the addressing cable (E70213) via the implemented addressing interface.

No addressing via the addressing socket while live.

Electrical connection

Connection of a 2-wire Pt100 element to the AS-i module

AS-i module Pt100 element

1+ ... 4+ 1- ... 4-

The 1+ ... 4+ terminals are interconnected in the module.

Connection of a 4-wire Pt100 element to the AS-i module

AS-i module Pt100 element

1+ ... 4+ S+ S- 1- ... 4-

4-wire Pt100 sensors supply more exact results than 2-wire sensors provided that the wire resistance is the same.

The changeover between 2 and 4-wire sensors is made via the parameter bit P3.

The 1+ ... 4+ terminals are interconnected in the module.

It is necessary to connect at least one Pt100 sensor before switching on the AS-i slave to start the A/D converter, otherwise the LEDs I1 to I4 flash at a frequency of about 5Hz.

Important notes regarding Pt100 measurements:

In the Pt100 measurement principle, very low currents flow in the measuring electronics. It must be ensured that additional resistance (cables, contact and transition resistance, loose contacts, etc.) is avoided in the measuring circuit.

Only this way is a precise measurement, for which these modules are designed, possible.

In detail:

A 4-wire measurement always has to be preferred over a 2-wire measurement.

In 2-wire measurement all transition and connection resistances add up and may massively falsify the measurement result.

Therefore a 2-wire measurement is not recommended!

Parameter setting of the analogue modules

Parameter bit/Designation	Description		Comments
P0filter	1 50Hz filter in the A/D converter active		The 50Hz filter applies to the whole of Europe
	0 60Hz filter in the A/D converter active
P1, P2periphery fault	Parameter bit		Periphery fault can be triggered by
	P1 P2		1	2	3	4
	0	0	on	off	off	off
	0	1	on	on	off	off
	1	0	on	on	on	off
	1	1	on	on	on	on
P3selectionPt100 elements	1 2-wire mode
	0 4-wire mode

Activation of the periphery fault message of the channels 1 to 4

According to the table above the parameter bits P1 and P2 are used to define which measuring channels can trigger a periphery fault message. But irrespective of the defined parameters all 4 channels are always transferred via the AS-Interface.

Operation

Check the safe functioning of the unit. Display by LEDs:

• LED yellow I1 ... I4 off: not connected

on: analogue signal in the measuring range flashing: analogue signal outside the measuring range

• LED green AS-i on: AS-i voltage is applied
• LED rot FAULT on: AS-i communication error

flashing: periphery fault *

* periphery fault

A periphery fault is indicated if at least one of the signals I1, I2, I3 or I4 is outside the measuring range or if nothing is connected to at least one analogue channel.

Measuring range of the Pt100 module

For the measuring ranges, the LED states and their meaning please see the following table:

Range-200 ... +850°C	Unitsdec.	Unitshex.	LEDanalogue	Meaning
<-219.4°C	32767	7FFF	flashes	short circuit
-219.4°C ... -200.1°C	-2194 ... -2001	F76E ... F82F	on	below nominal range
-200°C ... +850°C	-2000 ... 8500	F830 ... 2134	on	nominal range
+850.1°C ... +883.6°C	8501 ... 8836	2135 ... 2090	on	above nominal range
>+883.6°C	32767	7FFF	off	wire break

Transmission time of the analogue values

The transmission time of the analogue values depends on the conversion time of the analogue signals into digital signals in the AS-i module and on the transmission time via the AS-Interface.

The conversion time for 4 Pt100 signals is 480ms.

The transmission time of the 4 16-bit values via the AS-Interface ideally is 7 AS-i cycles per value. For a cycle time of 5ms per AS-i cycle this results in a transmission time of 4 x 7 x 5ms = 140ms via the AS-Interface.

Thus the total transmission time for 4 temperature values ideally is 480ms (conversion time) + 140ms (transmission time) = 620ms.