Electrical Connection¶
The analog input module AI561 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 AI561 must not be used as a remote expansion 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.
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) 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:
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 | — | Reserved |
| 14 | — | Reserved |
| 15 | — | Reserved |
| 16 | — | Reserved |
| 17 | — | Reserved |
| 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 L+/UP and M/ZP of the CPU/bus module increases by 10 mA per AI561.
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.
Attention
:strong:Risk of damaging the PLC modules!
The PLC modules must not be removed while the plant is connected to a power supply.
Make sure that all voltage sources (supply and process voltage) are switched off before you
- connect or disconnect any signal or terminal block
- remove or replace a module.
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 AI561 - Analog Input 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 Ω 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 module AI561. 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 module AI561. 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 meaning of the LEDs is described in the Displays section AI561 - Analog Input Module.