Model 1734-IB8S
Brand Allen
Product name secure digital input
The 1734-IB8S is part of the Allen-Bradley PLC family and connects safety digital inputs such as emergency stop buttons, door switches and safety light curtains. Its nominal input voltage is 24 V DC, large input current is 175 mA, and large power consumption is 3.4W. Each module has 8 inputs, and the current absorption input type has a reaction time of less than 16.2 milliseconds.
| Parameter |
Value |
| Product Model |
Allen 1734-IB8S |
| Manufacturer |
Allen |
| Product Type |
Industrial Automation Control Module (Digital Input Module) |
| Power |
24V DC ±10%, 4W Maximum Consumption |
| Communication / Protocol |
DeviceNet, EtherNet/IP, ControlNet, Modbus RTU |
| Operating Temperature |
-20°C – 70°C (-4°F – 158°F), 5% – 95% RH (Non-Condensing) |
| Mounting |
DIN Rail Mount (35mm Standard) / Panel Mount Optional |
| Dimensions (HxWxD) |
110mm x 35mm x 100mm (4.3" x 1.4" x 3.9") |
| Weight |
320g (0.71 lbs) |
| Typical Interfaces |
8 Isolated Digital Inputs, 1 Ethernet Port (RJ45), 1 DeviceNet Port |
| Compliance |
IEC 61131-2, CE, UL 1604, RoHS 3.0, ATEX Zone 2 |
In addition, the 1734-IB8S has a large power bus current of 25 mA (no load) and a continuous isolation voltage of 50 V. It measures 77 x 25 x 55 mm or 3.03 x 0.98 x 2.17 inches.
The 1734-IB8S can be used with SmartGuard, GuardLogix, and Compact GuardLogix controllers, and is used to manage CIP security protocol extensions in POINT I/O platforms.
The Input Safety module is a safety meter for applications with Safety Instrument Class (SIL) requirements.

For example, the 1734-IB8S is an Allen-Bradley manufactured module with eight current absorbing input channels and four pulse current source pulse test outputs, commonly used for emergency stop buttons, door switches, light curtains, and other safety device connections.
1734-IB8S pulse current source is a device that adopts high-speed field effect tube to replicate and multiply the constant current source current, reduce the influence of pulse current source output load on the depth negative feedback part of the front stage, improve the stability of the circuit, and use the analog multiplexer to control the current mirror gate to transfer the pulse signal to the pulse current, so as to output the pulse current.
1734-IB8S pulse current source circuit output pulse current amplitude is stable, the pulse front is steep, can meet different laser drive and test needs.