Operation Manual

Input Registers (Read-Only Parameters)

These parameters provide read-only access to the module's current status and measurements.

Note: For 4 Channel Version (AIMS-4X), ignore Bit-4 to Bit-15. For 8 Channel Version (AIMS-8X), ignore Bit-8 to Bit-15.

Holding Registers (Read / Write Parameters)

These parameters allow configuration of input types, alarm settings, and communication parameters.

Configuring Communication Parameters

These parameters set the communication properties for the MODBUS interface.

Notes

Note 1

Thermocouples (J, K, T, R, S, B, N) and RTD Pt100 (3-wire) Inputs: The process value is always measured in 0.1°C/°F resolution. That is, for example, the value 300 means 30.0°C / °F. The same should be followed while setting the values for the parameters that are resolution based (like Zero Offset, Alarm Set-point, Alarm Hysteresis, etc.). That is for example, set 300 counts for 30.0°C / °F.

DC mA / mV / V Inputs (Also Refer Appendix A : DC Linear Signal Interface): The measured PV is a Resolution-less Scaled Value derived using the values for the parameters: Signal Low, Signal High, Range Low and Range High. The parameter `DC Resolution' holds the desired resolution that can be used to insert appropriate Decimal Place in the scaled PV. For example, if the DC Resolution value is 2 (0.01) then the scaled value of 3000 can be read as 30.00. Similarly the corresponding parameters like Zero Offset, Alarm Set-point, Alarm Hysteresis, etc., are also resolution less and, if desired, the parameter value for `DC Resolution' should be used for appropriate Decimal Place.

Note 2

Conditional Parameters are those whose usage depend upon the values set for some other parameters. For example; the parameters `Signal Low' & `Signal High' for a selected channel are used only if the input type for the selected channel is DC Input (mV / V / mA). The access to the conditional parameters for Read / Write operation, however, is not restricted.

Table 1: Input Type Ranges

This table lists the typical ranges and resolutions for various input types.

Configuring Communication

This section details the physical switch settings and indicator behavior for communication configuration.

Switch Position and Mode

Illustration shows a slide switch with two positions: 'Down' and 'Up'. Each position has two switches, labeled 1 and 2. The 'Mode Indicator' is shown as OFF for 'Normal' Operation Mode and ON for 'Configuration' Mode.

• Switch Position 'Down': Switch 1 ON, Switch 2 OFF. Corresponds to 'Normal' Operation Mode.
• Switch Position 'Up': Switch 1 ON, Switch 2 OFF. Corresponds to 'Configuration' Mode.

Mode Indicator LED: The LED status indicates the current mode. ON means Configuration Mode, OFF means Normal Operation Mode.

Communication Parameter Values

When in Configuration Mode, the following parameters can be set:

• Module Slave ID: 1 to 247 (Default: 1)
• Baud Rate: 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps (Default: 9600 bps)
• Parity: None, Even, Odd (Default: Even)

Overall Dimension

Diagram showing the front and side views of the AIMS-4/8X module. Dimensions are: Width (W): 22.5 mm, Height (H): 101.0 mm, Depth (D): 119.0 mm.

Electrical Connections

Diagram illustrating the signal connections for the 4/8 Channel Analog Input Module with MODBUS over RS485 Serial Interface. The module features terminals for PWR, STATUS, RX, TX, ALARM, and signal inputs (AI-1 to AI-8, RTD, TC, V/mV, mA). It requires RS485 communication and a 24 VDC Supply. Note: For the 4 Channel Version, the connectors for AI-5 to AI-8 are not fitted.