AC2526 - Electronic module IFM - Free user manual and instructions

Product Type	AS-i Analog Input Module
Brand	IFM
Model	AC2526
Category	Electronic Module
Number of channels	4 analog inputs (current 4…20 mA)
AS-i Profile	S-7.3.E (AS-i specification V2.1)
Resolution	1 A
Power supply	Via AS-i (max. 100 mA for sensors) or external 24 V SELV (max. 500 mA, black flat cable)
Conversion time per channel	20 ms (1 channel), 120 ms (2 channels), 180 ms (3 channels), 240 ms (4 channels)
Nominal measurement range	4 … 20 mA (digital value 4000 … 20000)
LED display	PWR (green), AUX (green), FAULT (red), AI-1…AI-4 (yellow)
Sensor connection	M12 5-pin connectors
Addressing	Addresses 1 to 31 via addressing unit (AC1144) or cable E70213
Mounting	On wiring base, tightening torque 0.8 Nm
Max. number of modules per AS-i beam	31
Main functions	Conversion of 4…20 mA analog signals into digital data, bidirectional transmission via AS-i, peripheral fault detection
Care and cleaning	No specific maintenance. Clean with a dry, lint-free cloth. Disconnect power before cleaning.
Safety	Observe SELV voltages (24 V). Disconnect the module before any intervention. Use protective equipment if necessary.
Spare parts and repairability	Wiring bases (AC5000, AC5001, AC5003, AC5010, AC5011) and addressing cable E70213 available. Module not repairable, replace if defective.
General information	Manual available in French at notice-facile.com. Free PDF download.

Frequently Asked Questions - AC2526 IFM

How to address the AC2526 module?

You can address the module before mounting using an addressing unit (AC1144) to assign a free address between 1 and 31. With a wiring base equipped with an addressing socket (AC5010/AC5011), you can address the module later via the addressing cable E70213.

What to do if the FAULT LED is lit red?

A red FAULT LED indicates an AS-i communication error. Check the connection to the AS-i network and the presence of AS-i voltage. If the LED flashes, it indicates a peripheral fault (e.g., analog signal out of range or channel activated without sensor).

How to connect a 2-wire sensor without its own power supply?

Connect the sensor + wire to pin 1 (sensor supply +24V), the signal wire to pin 2 (Al+ analog input), the - wire to pin 3 (sensor supply 0V) and the functional ground to pin 5. Leave pin 4 unconnected.

What is the measurement range of the AC2526 module?

The nominal range is 4 to 20 mA. Below 4 mA (down to 1 mA) and above (up to 23 mA), the signal is considered out of range. Beyond 23 mA or below 1 mA, the module indicates a wire break or fault.

How to configure the analog channels?

Use parameter bits P0 to P3. P0 selects 2/3-wire operation. P1 and P2 activate the channels (see table in the manual). P3 enables or disables the peripheral fault display. Settings are made via the AS-i master.

Can I power the sensors via the AS-i module?

Yes, sensor power can be supplied via the AS-i bus up to a maximum of 100 mA. If the total current exceeds 100 mA, an external 24V SELV power supply is required (via suitable base AC5003 or AC5011).

What does the flashing of a yellow AI LED mean?

A flashing yellow AI LED indicates that the analog signal is outside the measurement range (e.g., current <1 mA or >23 mA) or that no sensor is connected to this channel while it is activated.

What is the transmission time for two analog channels?

The conversion time for two channels is 120 ms. Transmission via AS-i (ideal) takes 2 x 7 AS-i cycles = 70 ms (with cycle of 5 ms). So a total of about 190 ms.

Can the module be mounted on any base?

The AC2526 module mounts on IFM wiring bases. For later addressing, use models with addressing socket (AC5010/AC5011). Standard bases (AC5020...AC5023) can be used for better immunity to interference.

Where to find the complete manual for the AC2526 module?

The complete manual is available for free PDF download at notice-facile.com. You can also request a translation into another language by providing your email address.

USER MANUAL AC2526 IFM

Top-down schematic of a room layout with labeled compartments and circular symbols (no text or labels)

3 4 5 2 1 U+ analog in Strom

3 4 5 2 1 analog in Strom U+ U-

Function and features

The slave converts analogue input signals and transfers them to the AS-i master via the AS-Interface. The AS-i module operates as a slave with bidirectional data transfer in the AS-i network.

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

• Current measurement 4 ... 20mA
• AS-i profile S-7.3.E
• The sensors are connected via M12 connection cables
  • Maximum number of modules per AS-i system: 31
• R_i current measurement < 50

- Time for converting the measured values in the slave

• for one channel: 20ms
• for two channels: 120ms
• for three channels: 180ms
• for four channels: 240ms

- Sensor supply from AS-i (max. 100mA) or external 24V PELV voltage source (black flat cable, max. 500 mA)

- Resolution: 1 A

Installation / Addressing

When you use module lower parts without addressing socket (AC5000, AC5001 or AC5003) first address the module by placing it onto an addressing unit (AC1144) and assign a free address between 1 and 31.

When you use module lower parts with an addressing socket (AC5010 or AC5011) the modules can be addressed with the addressing adapter E70213 later on.

Mount the module onto the wired module lower part of the AS-i network, tightening torque 0.8Nm.

As an alternative FC/FC-E lower parts with earthing lead (AC5020...AC5023) can be used to increase the noise immunity.

90 LED infrared reciever fixture infrared adapter LED red FAULT LED green PWR 83 label M12 socket

4x LED yellow analogue inputs
LED green AUX

Pin 1: sensor supply +24V

Pin 2: Al+ analogue input

Pin 3: sensor supply 0V

Pin 4: not connected

Pin 5: functional earth

Electrical connection

The analogue module is connected to the AS-Interface via the standardised EMS (supply from AS-i) or the E-EMS (supply from an ext. 24V PELV voltage source).

If the supply is to be from an external 24V source, a FC-E lower part (art. no. AC5003 or AC5011) must be used.

If a total of over 100mA is needed for the sensor supply, the supply must be from an external 24V PELV voltage source.

The supply is automatically changed when the external 24V voltage is supplied.

Current measurement

For all the following wiring diagrams the indicated pin connection refers to the analogue module.

Connection of a 2-wire sensor without own supply

Pin 1: sensor supply +24V
Pin 2: Al+ analogue input
Pin 3: sensor supply 0V
Pin 4: not connected
Pin 5: functional earth

3 4 5 1 2 U+ analogue in current

Connection of a 2-wire sensor with own supply

Pin 1: sensor supply +24V
Pin 2: Al+ analogue input
Pin 3: sensor supply 0V
Pin 4: not connected
Pin 5: functional earth

3 4 5 2 1 I+ I-

Connection of a 3-wire sensor without own supply

Pin 1: sensor supply +24V
Pin 2: AI+ analogue input
Pin 3: sensor supply 0V
Pin 4: not connected
Pin 5: functional earth

3 4 5 1 2 analogue in current U+ U-

Parameter setting of the analogue modules

Parameter bit	Designation	Description
P0		1 2-/3-wire operation
P1, P2	channel activation	P1	P2	channel1	channel2	channel3	channel4
		0	0	on	off	off	off
		0	1	on	on	off	off
		1	0	on	on	on	off
		1	1	on	on	on	on
P3	periphery fault	1 periphery fault indication active0 periphery fault indication not active

Operation

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

• LED yellow AI-1...AI off: no sensor connected

(at least one LED flashes because not all channels can be deactivated via the parameter bit P1/P2 (channel activation))

• LED yellow AI-1...AI-4 on: analogue signal in the measuring range
- LED yellow AI-1...AI-4 analogue signal outside the measuring - flashes: range or no sensor connected
- LED green PWR on: AS-i voltage is applied
• LED green AUX on: external 24V voltage is applied
- LED red FAULT on: AS-i communication error
- LED red FAULT flashes: periphery fault*

* periphery fault

A periphery fault is indicated:

• if at least one of the analogue signals is outside the value range.
• if nothing is connected to at least one analogue channel although the respective channel is activated

Measuring range of the analogue input modules

The measuring ranges, the states of the LEDs and their meaning are indicated in the following tables:

Analogue input module 4 ... 20mA

Range4 ... 20mA	Unitsdec.	Unitshex.	LED AI1...AI4 analogue	Meaning
< 1mA 32767	7FFF flashes wire break
1mA ... 3.999mA	1000 ... 3999	03E8 ... 0F9F	on	below nominal range
4mA ... 20mA	4000 ... 20000 0FA	0 ... 4E20 on nominal range
20.001mA ... 23mA	20001 ... 23000	4E21 ... 59D8 on above nominal		range
> 23mA	32767	7FFF	flashes	outside range

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.

Example: Transmission time of 2 analogue channels

The conversion time for 2 analogue input signals into digital signals is 120ms. The transmission time of the 2 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 2 x 7 x 5ms = 70ms via the AS-Interface.

Thus the total transmission time for 2 analogue values ideally is 120ms (conversion time) + 70ms (transmission time) = 190ms.

Example: Transmission time of 4 analogue channels

The conversion time for 4 analogue input signals into digital signals is 240ms. 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 analogue values ideally is 240ms (conversion time) + 140ms (transmission time) = 380ms.