Electrical Connection

The analog input/output module AX561 can be connected to the following devices via the I/O bus connector:

• S500 bus modules (e. g. CI592-CS31, CI501-PNIO, CI541-DP, CI581-CN)
• AC500 CPUs (PM5xx)
• other AC500 I/O modules

Note

The AX561 must not be used as a decentralized communication interface module at DC505-FBP and CI590-CS31-HA bus modules.

Note

For a detailed description of the mounting, disassembly and electrical connection of the module, please refer to the System Assembly chapter AC500-eCo.

Note

If the output is configured as not used, the voltage and current output signals are undefined and must not be connected.

The electrical connection is carried out by using a removable 9-pin and 11-pin terminal block. These terminal blocks differ in their connection system (spring terminals or screw terminals, cable mounting from the front or from the side). For more information, refer to terminal blocks for S500-eCo I/O modules TA563-TA565 - Terminal Blocks. The terminal blocks are not included in the module’s scope of delivery and must be ordered separately.

The following block diagram shows the internal construction of the analog inputs and outputs:

The assignment of the terminals:

Terminal	Signal	Description
1	R0	Burden resistor for input signal 0 for current sensing
2	I0+	Positive pole of input signal 0
3	I0-	Negative pole of input signal 0
4	R1	Burden resistor for input signal 1 for current sensing
5	I1+	Positive pole of input signal 1
6	I1-	Negative pole of input signal 1
7	R2	Burden resistor for input signal 2 for current sensing
8	I2+	Positive pole of input signal 2
9	I2-	Negative pole of input signal 2
10	R3	Burden resistor for input signal 3 for current sensing
11	I3+	Positive pole of input signal 3
12	I3-	Negative pole of input signal 3
13	O0U+	Voltage output of channel 0
14	O0I+	Current output of channel 0
15	O1U+	Voltage output of channel 1
16	O1I+	Current output of channel 1
17	O01-	Negative pole of channels O0 and O1
18	SG	Signal ground
19	L+	Process voltage L+ (24 VDC)
20	M	Process voltage M (0 VDC)

The internal power supply voltage for the module’s circuitry is carried out via the I/O bus (provided by a bus module or a CPU). Thus, the current consumption from 24 VDC power supply at the terminals UP/L+ and ZP/M of the CPU/bus module increases by 5 mA per AX561.

The external power supply connection is carried out via the L+ (+24 VDC) and the M (0 VDC) terminals. The M terminal is electrically interconnected to the M/ZP terminal of the CPU/bus module.

Attention

:strong:Risk of imprecise and faulty measurements!

Analog signals may be distorted seriously by external electromagnetic influences.

Use shielded wires when wiring analog signal sources. The cable shield must be grounded at both ends of the cable. Provide a potential equalisation of a low resistance to avoid high potential differences between different parts of the plant.

Warning

:strong:Removal/Insertion under power

The devices are not designed for removal or insertion under power. Because of unforeseeable consequences, it is not allowed to plug or unplug devices with the power being ON.

Make sure that all voltage sources (supply and process voltage) are switched off before you

• connect or disconnect any signal or terminal block
• remove, mount or replace a module.

Disconnecting any powered devices while energized in a hazardous location could result in an electric arc, which could create a flammable ignition resulting in fire or explosion.

Make sure that power is removed and that the area has been thoroughly checked to ensure that flammable materials are not present prior to proceeding.

The devices must not be opened when in operation. The same applies to the network interfaces.

Attention

:strong:Risk of damaging the PLC modules!

Overvoltages and short circuits might damage the PLC modules.

• Make sure that all voltage sources (supply and process voltage) are switched off before you begin with operations at the system.
• Never connect any voltages or signals to reserved terminals (marked with —). Reserved terminals may carry internal voltages.

The module provides several diagnosis functions AX561 - Analog Input/Output Module.

The following figure is an example of the internal construction of the analog input AI0. The analog inputs AI1 … AI3 are designed in the same way.

Internal construction of the analog inputs

Caution

:strong:Risk of damaging the analog input!

The 250 W input resistor can be damaged by overcurrent.

Make sure that the current through the resistor never exceeds 30 mA.

The following figures are an example of the electrical connection of analog sensors (voltage) to the input I0 of the analog input/output module AX561. Proceed with the inputs I1 to I3 in the same way.

Connection of active-type analog sensors (voltage)	Connection of passive-type analog sensors (voltage)

The following figures are an example of the electrical connection of analog sensors (current) to the input I0 of the analog input/output module AX561. Proceed with the inputs I1 to I3 in the same way.

Connection of active-type analog sensors (current)	Connection of passive-type analog sensors (current)

The following figures are an example of the electrical connection of analog actuators to the analog input/output module AX561.

Connection of analog voltage actuators	Connection of analog current actuators

Note

The output signal is undefined if the supply voltage at the L+ terminal is below 10V. This can, for example, occurr if the supply voltage has a slow ramp-up / ramp-down behaviour and must be foreseen when planning the installation.

Note

If the output is configured in current mode, the voltage output signal is undefined and must not be connected.

If the output is configured in voltage mode, the current output signal is undefined and must not be connected.

The meaning of the LEDs is described in the displays chapter AX561 - Analog Input/Output Module.