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RB16 Relay Board

Provides 16 industry standard relay module sockets to a LabJack U12. Image shows RB16 with standard and miniature modules installed. The RB16 provides a versatile method for electricians, engineers, and other qualified individuals, to interface a LabJack U12 with high voltages/currents.


I/O modules are available from a variety of manufacturers such as Grayhill, Crydom, or Kyoto, and allow the LabJack U12 to control or monitor 120/240 VAC and/or 3-60 VDC. The following Grayhill modules are available for purchase from Digikey: 70M-OAC5 (AC output), 70M-ODC5 (DC output), 70M-IAC5 (AC input), 70M-IDC5 (DC input).



  • Relay modules are NOT included

  • Modules are available with voltage ratings up to 200 VDC or 280 VAC, and current ratings up to 3.5 amps

  • DB25 cable is included

  • Made by Electronic Innovations Corp.

  • LabJack U12 only. See the RB12 for other devices


Note: The user can also install a resistor to bypass each socket and pass through the standard digital I/O line.

Details

Details

Description

The RB16 provides a versatile method for electricians, engineers, and other qualified individuals, to interface a PC with high voltages/currents. A row of screw terminals provides the interface to the high level isolated signals. These can be either 120/240-volt AC signals or 3 to 60 volt DC signals. The DB25 connector provides the interface to standard logic level signals (+5 volt levels). The RB-16 was designed to be pin compatible with the LabJack U12, which is a USB-based multifunction data acquisition and control device. The RB16 also comes with a DB25 male to female cable for connection to the LabJack or other equipment.

I/O modules are available from a variety of manufacturers such as Grayhill, Crydom, or Kyoto and from distributors such as Digikey and Future Electronics. The following are recommended miniature modules:

  • Grayhill 70M-OAC5, Digikey #GH7022-ND, Allows a +5 volt logic output to control up to 3 amps of 24-140 VAC. Example: use this module to turn a household light on and off.
  • Grayhill 70M-ODC5, Digikey #GH7024-ND, Allows a +5 volt logic output to control up to 3 amps of 3-60 VDC. Example: use this module to turn a 12 volt automotive light on and off.
  • Grayhill 70M-IAC5, Digikey #GH7026-ND, The presence or absence of 120 VAC creates a 0 or +5 volt DC signal for connection to a logic input. Example: use this module to detect whether a household light is on or off.
  • Grayhill 70M-IDC5, Digikey #GH7027-ND, The presence or absence of 3-32 VDC creates a 0 or +5 volt DC signal for connection to a logic input. Example: use this module to detect whether an automotive light is on or off.

All these modules provide optical isolation between the high voltage side and the logic side. It should be noted that the output modules require inverted logic, that is, a logic low input signal to turn on the output. For an input module, logic sense is normal, that is, if an AC or DC signal is present at the terminal block depending on the type of module, a logic high will be sensed by the LabJack.

The RB16 will accept either 16 miniature style modules or 8 standard size modules.

The schematic of one section of the RB16 is shown in Figure 1. This circuit is repeated 16 times. An input or output, depending on the module type, comes from a DB25 connector. The output or input is connected to the screw terminals. The screw terminals are intended to accommodate voltages up to 240 volts AC either as an output or as an input. The DB25 connector signals are low level DC signals.

Resistor R1 in Figure 1 is a pull up to VCC (normally +5 volts). Resistor R2 is a feed through resistor for applications where the RB16 will be used as a breakout box for the DB25 signal(s). The application of R2 was mainly intended for the LabJack, where the user might want some of the I/O signals brought out directly to the screw terminals. The resistor can be of any convenient value that will pass the signals back and forth. When the user installs this resistor, the module sockets will be blocked from accepting the module.

The printed circuit board and dimensions are shown in the figure below. The board comes with 0.5-inch standoffs to allow mounting to a chassis. The hole pattern and spacing are repeated.

The following table shows pin out functions of the DB25 connector.

DB25 Pin No Output Control
1 R0
2 R1
3 R2
4 R3
5 R4
6 R5
7 R6
8 R7
9 NC
10 VCC
11 VCC
12 VCC
13 VCC
14 GND
15 GND
16 GND
17 GND
18 R8
19 R9
20 R10
21 R11
22 R12
23 R13
24 R14
25 R15

The complete schematic of the RB16 is shown on the next page. There are 3 resistors added on the last 3 I/O modules to terminate special I/O functions of the LabJack U12. These resistors will not normally affect the operation of the RB16.

 


  Product Comparison

U12 U3-LV U3-HV U6 U6-Pro UE9 UE9-Pro T7 T7-Pro
AIN Voltage ±10V 0-2.4V ±10V [1] ±10V ±10V ±5V ±5V ±10V ±10V
Analog Inputs 8 16 16 14 14 14 14 14 14
Effective Resolution [2] 12 bit 12 bit 12 bit 16 bit 22 bit 12 bit 20 bit 16 bit 22 bit
Digital I/O 20 20 16 20 20 23 23 23 23
Logic Level 5V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V
Analog Outputs 2 2 2 2 2 2 2 2 2
Counters 1 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 10 Up to 10
USB Yes Yes Yes Yes Yes Yes Yes Yes Yes
LJTick Compatible No Yes Yes Yes Yes Yes Yes Yes Yes
Internal Temp Sensor No Yes Yes Yes Yes Yes
Yes
Yes Yes
Thermocouple Ready [3] No No No Yes Yes No Yes Yes Yes
Ethernet No No No No No Yes Yes Yes Yes
Scripting No No No No No No No Yes Yes
Wireless No No No No No No No No Yes
Real-time Clock No No No No No No No No Yes
[1] Can be configured for -10V to +20V range.
[2] According to actual measured data, see related Noise and Resolution (App Note)
[3] If not thermocouple ready, can purchase an amplifier like the LJTick-InAmp, see related Thermocouples (App Note)