The Allen-Bradley 1734-IB8S is a safety-rated digital input module from the POINT Guard I/O family, certified to SIL 2 (IEC 61508) and PL d (ISO 13849-1). It features 8 sinking safety inputs operating at 19.2-28.8V DC with configurable input filters from 0-126 ms. Each channel supports dynamic pulse testing for automatic short-circuit and cross-channel fault detection. Designed for use with GuardLogix, Compact GuardLogix, and SmartGuard safety controllers, the 1734-IB8S is deployed in safety-critical applications such as emergency stop circuits, light curtains, safety door interlocks, two-hand control stations, and safety mats in automotive, food & beverage, and heavy machinery industries.
Frequently Asked Questions
Q: What is the difference between the 1734-IB8 and 1734-IB8S?
A: The 1734-IB8S is a safety-rated module (SIL 2 / PL d) with built-in pulse testing for fault detection. The 1734-IB8 is a standard (non-safety) input module.
Q: What safety level does the 1734-IB8S achieve?
A: SIL 2 per IEC 61508 and Performance Level d (PL d) per ISO 13849-1.
Q: What safety controllers is it compatible with?
A: GuardLogix, Compact GuardLogix, and SmartGuard safety controllers.
Q: Does the 1734-IB8S support pulse testing for short-circuit detection?
A: Yes, each channel supports dynamic test pulse outputs to detect short circuits and cross-channel faults.
Q: What is the configurable input filter range?
A: 0 to 126 ms in 6 ms steps, configurable per channel for clean signal debouncing.
Q: Can the 1734-IB8S be used in standard (non-safety) applications?
A: While technically possible, it is designed for safety circuits and should be paired with certified safety controllers.
