G4 Analog I/O Modules
About Opto 22 G4 Analog I/O Modules
Introduced in 1990, G4 I/O offered a more compact footprint than the earlier G1 and added an LED status indicator on the top of the module. Thousands of customers continue to rely on G4 discrete and analog I/O in their legacy Optomux and mistic systems. G4 analog I/O provides complete electrical channel-to-channel isolation. Isolation eliminates troublesome ground loop problems. Wide variety of signal inputs include RTD, ICTD, voltage, current, thermocouple, and TPO.
Ways to use G4:
1. As industrial I/O for a Raspberry Pi.
Yes, you can sense and switch industrial signals with your Raspberry Pi. Use the Pi with G4 digital I/O for prototyping and in areas that do not require industrially hardened control equipment.
2. For more robust SNAP PAC system sensing and switching.
Use a SNAP TEX breakout board to expand the capability of your SNAP high-density digital (HDD) I/O modules. The SNAP-UDC-HDB-G4 breakout board holds up to 32 G4 digital input or output modules to match the SNAP HDD input or output module you have. You get the 3 amp per channel ability of the G4 where you need it, mixed in with analog, digital, and serial modules on a compact SNAP PAC rack.
3. With E1 and E2 brains in a legacy Optomux system.
E1 and E2 brains replace the obsolete B1 and B2 brains, work with G4 I/O, and provide communications over both Ethernet and serial networks. E1s and E2s are also designed for customers who need to upgrade Optomux systems to use Ethernet networking, while preserving existing I/O racks, modules, and field wiring.
View All G4 Analog I/O Modules
G4AD10
The G4AD10 module provides a single channel of optically-isolated temperature-to-digital conversion. This module also includes complete electrical channel-to-channel isolation, which eliminates troublesome ground loop problems.
G4 100 0hm Platinum RTD Analog Input
G4AD10
| RTD Input | 100 Ω platinum (α = 0.00385) |
| Nominal Temperature Range °C | -50 to 350 °C |
| Nominal Temperature Range °F | -58 to 662 °F |
| Over/under Range °C | -72 to 812 °C |
| Over/under Range °F | -97.6 to 1493 °F |
| Accuracy* | *±0.8 °C |
| Resolution | 12 bits |
| Response Time | Full-scale step change in 100 ms |
| Isolation (Transient) Input-to-output Input-to-analog supply | 4,000 VRMS 4,000 VRMS |
| Ambient Temperature | |
| Operating | 0 to 70 °C |
| Storage | -25 to 85 °C |
| Agency Approvals | UL, CE; UKCA |
| *Accuracy figure requires use of gain and offset commands. | |
G4AD3
The G4AD3 module provides a single channel of transformer and optically isolated current-to-digital conversion. The nominal input range is 4 to 20 milliamps, with an under/over-range capability from less than 3 milliamps to greater than 35 milliamps.
G4 4 to 20 mA Analog Input
G4AD3
| Nominal Input Range | 4 to 20 mA |
| Module Input Impedance* | 414 Ohms* |
| Over/under Range | 3 to 35 mA |
| Loop Supply | 28 VDC nominal |
| Accuracy** | 16 µA** |
| Response Time | Full-scale step change in 3 ms |
| Resolution | 12 bits |
| Isolation (Transient) Input-to-output Input-to-analog supply | 4,000 Vrms (I-O) 4,000 Vrms (I-A) |
| Ambient Temperature | |
| Operating | -30 °C to 70 °C |
| Storage | -40 °C to 85 °C |
| Agency Approvals | UL, RoHS, CE; UKCA |
| * This is the equivalent impedance for the G4AD3 at full scale (20mA). The equivalent impedance is calculated by using the following formula: Equivalent impedance = 249 Ohms + 3.3V/0.02A = 414 Ohms The module has an internal resistance of 249 Ohms in series with a 3.3V zener diode. For more information, see form #426. ** Accuracy figure requires use of gain and offset commands. | |
G4AD8
The G4AD8 provides a single channel of transformer and optically isolated temperature-to-digital conversion from a Type K thermocouple input. This module also includes complete electrical channel-to-channel isolation, which eliminates troublesome ground loop problems.
G4 Type K Thermocouple Analog Input
G4AD8
| G4AD8 | |
| Thermocouple Type | K |
| Nominal Temperature Range °C | -100° to 460° |
| Nominal Temperature Range °F | -148° to 860° |
| Accuracy* | ± 1 °C |
| Over/Under Range Capability °C | -150° to 1,372° |
| Over/Under Range Capability °F | -238° to 2,501° |
| Over/Under Range Accuracy | ± 2 °C |
| Agency Approvals | UL, RoHS, CE; UKCA |
| * Accuracy figure requires use of gain and offset commands. | |
G4DA3
The G4DA3 provides a single channel of transformer and optically isolated digital-to-current conversion for 4-20 mA current loops. The isolated loop supply can be provided by the module, eliminating the need for you to provide the loop power supply (typically 15-48 V) and associated wiring, barrier strips, and so on.
G4 4-20 mA Analog Output
G4DA3
| Response Time | Full scale step change in 3 ms |
| Maximum Loop Resistance (when sourcing loop) | 650 W |
| Resolution | 12 bits |
| Isolation (Transient) Input-to-output Input-to-analog supply | 4,000 Vrms (I-O) 4,000 Vrms (I-A) |
| Ambient Temperature | -30° to 70° C |
| Storage | -40° to 85° C |
| Output Current | 4-20 mA |
| Accuracy | 16 µA |
