IOMOD 4Cs4Vs

IOMod 4Cs4Vs is a compact-sized stand-alone power meter used for measuring analog AC input signals from low power current and voltage sensors. It measures three phases of AC voltages and currents with additional input for neutral/residual voltage and current. Measured and calculated values transmitted to the host system via industry standard IEC 60870-5-103 and Modbus RTU communication protocols.

IOMOD 4Cs4Vs User Manual

Introduction

IOMod 4Cs4Vs is a compact-sized stand-alone power meter for measuring analog AC input signals from low-power current and voltage sensors.  It measures three phases of AC voltages and currents with additional inputs for neutral/residual voltage and current. The measured and calculated values are transmitted to the host system via communication protocol IEC 60870-5-103 or Modbus RTU.

Features

Common configuration information

  1. Nominal system frequency. In order to get correct three-phase system measurements, a user must select nominal system frequency – either 50Hz or 60Hz.
  2. Process parameters. There user can set rated primary current and voltage values which are used for calculating measured data in primary values. Those values are available only via float registers in the Modbus RTU protocol.
  3. Configuration of sensors. The power meter is designed to work with standard low-power current and voltage sensors with a nominal output value of 225mV for the current sensor and 3.25√3 V (1.876V) for the voltage sensor. If current sensors have some deviation from the nominal value, a user can define the exact sensor voltage. The new value will be set the same for all current sensors inputs. Each voltage sensor input has a separate correction parameter called the magnitude factor. This factor is used to multiply measured voltage. For example, if a sensor has a 5% lower output voltage, the user can set the magnitude to 1050. The actual factor will be 1.05 and the measured value will be multiplied by this factor. This factor can be used in cases when several measuring devices are connected to the same sensor in parallel. In this case, the parallel connection will reduce the internal resistance of the sensor and consequently output voltage. The magnitude factor can be used to compensate for this deviation.
  4. Communication protocol. Selection of IEC 60870-5-103 or Modbus RTU communication protocol.

Connection diagram

Fig. 4.1. IOMOD 4CS4VS internal structure and connection diagram Fig. 4.1. IOMOD 4CS4VS internal structure and connection diagram

Technical information


System
1. Dimension 101 x 119 x 17.5 mm
2. Case ABS, black
3. Working environment Indoor
4. Working temperature -30 | +70
5. Recommended operating conditions  5 – 60°C and 20 – 80%RH;
6. Configuration

USB – configuration terminal via com port

7. Firmware upgrade USB – mass storage device

Electrical specifications

8. Inputs

16-bit resolution,

Input resistance: ~1 MOhm

Input capacitance: ~170pF

Input Ranges:

  • Current input:
    • nominal 225mV (rms);
  • Voltage input:
    • nominal 1.876V (rms);
Overvoltage protection up to ±20V (all inputs)

Power

9. Power Supply 9V to 33V
10. Current consumption 40mA @ 12VDC, 20mA @ 24VDC

RS485 Interface

IOMod 4Cs4Vs has an integrated 120Ω termination resistor, which can be enabled or disabled via the configuration terminal. It is recommended to use termination at each end of the RS485 cable. See the typical connection diagram in Fig. 6.1.

Fig. 6.1. Typical IOMod connection diagramFig. 6.1. Typical IOMod connection diagram

IOMod 4Cs4Vs has a 1/8 Unit load receiver which allows having up to 255 units on a single line (compared to standard 32 units). To reduce reflections keep the stubs (cable distance from the main RS485 bus line) as short as possible.

Configuration over USB

Driver installation

The device requires USB drivers to work as a Virtual COM port. The first-time connection between the device and the computer could result in a “Device driver software was not successfully installed” error (as in Fig. 7.1). 

Fig. 7.1. Unsuccessful device software installation error Fig. 7.1. Unsuccessful device software installation error 

A user then should manually install drivers by selecting a downloaded driver folder: