AC2521 - Electronic module IFM - Free user manual and instructions

Product type	AS-i electronic module
Brand	IFM
Model	AC2521
Category	Electronic module
Main function	AS-i slave converting analog input signals into digital data
AS-i profile	S-7.3.6 per AS-i specification V2.1
Current measurement	0 ... 20 mA
Resolution	1 μA
Maximum number of modules per AS-i strand	31
Power supply	24 V DC external via flat cable (max. 1.1 A total)
Sensor connection	M12 connectors
Conversion time	< 1 ms
Transmission time (2 channels)	~71 ms (ideal case)
Transmission time (4 channels)	~141 ms (ideal case)
LED indicators	PWR (green), AUX (green), FAULT (red), AS1-AS4 (yellow)
Fault display parameter	P2: active or inactive
Addressing	Via AC1144 addressing unit or E70213 cable
Tightening torque	0.8 Nm

Frequently Asked Questions - AC2521 IFM

How to address the AC2521 module?

Addressing can be done in two ways: either by mounting the module on an AC1144 addressing unit to assign a free address between 1 and 31, or by using a wiring base with addressing socket AC5011 and the E70213 addressing cable for later addressing.

What types of sensors can be connected?

The module is designed for analog sensors with 0...20 mA output. Sensors are connected via 5-pin M12 connectors.

How to interpret the LEDs?

The green PWR LED indicates the presence of AS-i voltage. Green AUX signals external 24 V voltage. Red FAULT lit indicates an AS-i communication error, flashing indicates a device fault. The yellow AS1 to AS4 LEDs indicate the status of the analog channels.

What is the measurement range of the module?

The nominal range is 0 to 20 mA. Beyond that, up to 23 mA, the signal is considered above the nominal range. Above 23 mA, the LED flashes to indicate a value outside the permissible range.

How to configure the fault display?

Parameter P2 enables or disables the display of device faults. Set P2 to 1 to enable the display (FAULT LED flashes), set to 0 to disable it.

What is the transmission time of analog values?

For 2 channels, the total time is approximately 71 ms (1 ms conversion + 70 ms transmission). For 4 channels, it is approximately 141 ms (1 ms + 140 ms). These values are given in the ideal case with an AS-i cycle time of 5 ms.

How to connect a 3-wire actuator?

Pin 1: analog output, pin 2: actuator supply +24V, pin 3: analog output 0 V, pin 4: not connected, pin 5: functional earth. The 0 V outputs must not be interconnected.

What power supply is required?

The module requires an external 24 V DC SELV power supply via a black flat cable (max. 1.1 A total). AS-i power supply is also required for communication.

What to do if the FAULT LED flashes?

A flashing FAULT LED indicates a device fault. Check that the analog signals are within the permissible range (0...20 mA) and that connections are correct. If parameter P2 is set to 1, the fault is displayed.

Is it possible to replace the module?

Yes, the module is replaceable. To retain settings, make sure to note the AS-i address and parameters. Use a base with addressing socket to facilitate replacement without specific tools.

USER MANUAL AC2521 IFM

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 0 ... 20 mA
  AS-i profile S-7.3.6
• The sensors are connected via M12 connection cables
  Maximum number of modules per AS-i system: 31
• R_ for current output 600
• Time for converting the measured values in the slave: < 1 ms
• Actuator supply from external 24 V PELV voltage source (black flat cable, max. 1.1 A in total)
• Resolution: 1 A

Installation / Addressing

When you use module lower parts without addressing socket (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 (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 0.8 Nm.

Electrical connection

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

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

As an alternative FC-E lower parts with earthing lead (AC5021, AC5023) can be used to increase the noise immunity.

Wiring

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

The analogue outputs AO- must neither directly nor indirectly (via the connected actuator) be connected to each other.

Connection of a 3-wire actuator

Analogue module 3-wire actuator

Pin 1: AO+ analogue output
Pin 2: actuator supply +24 V
Pin 3: AO- analogue output 0V
Pin 4: not connected
Pin 5: functional earth

Parameter setting of the analogue modules

Parameter bit	Description
P0	1 reserved 0 reserved
P1	1 reserved
not used	0 reserved
P2	1 periphery fault indication active
periphery fault	0 periphery fault indication not active
P3	1 reserved
not used	0 reserved

Operation

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

• LED yellow AO1...AO4 on:

analogue signal in the measuring rangeor no actuator connected. It cannot be differentiated whether the 0V signal is applied or whether an actuator is con-. nected

• LED yellow AO1...AO4 flashes: analogue signal outside the measuring range (outside range)

• 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.

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 output module 0 ... 20 mA

Range 0 ... 20mA	Units dec.	Units hex.	LED AO1...AO4 analogue	Meaning
0mA ... 20mA	0000 ... 20000	0000 ... 4E20	on	nominal range
20.001mA ... 23mA	20001 ... 23000	4E21 ... 59D8	on	above nominal range
>23mA	>23000	>59D8	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.

The conversion time for 2 analogue input signals into digital signals is < 1 ms. 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 × 7 × 5 ms = 70 ms via the AS-Interface.

Thus the total transmission time for 2 analogue values ideally is 1ms (conversion time) +70ms (transmission time) = 71ms .

Example: Transmission time of 4 analogue channels

The conversion time for 4 analogue input signals into digital signals is < 1 ms. 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 5 ms per AS-i cycle this results in a transmission time of 4 × 7 × 5ms = 140ms via the AS-Interface.

Thus the total transmission time for 4 analogue values ideally is 1 ms (conversion time) + 140 ms (transmission time) = 141 ms.