This module (Item No. 750-1689) features two independently switchable relay outputs (RO1 … RO2) and is particularly suitable for applications that require individually electrically isolated outputs, need to switch high loads, or must be controlled using different voltage types (e.g., DC and AC). The module supports operating voltages up to 250 VAC and 250 VDC. The electrically isolated outputs can be freely combined with each other, so that Cat.2 or Cat.4 architectures up to SIL3 or PLe are possible. Details on possible wiring options can be found in the product manual. The relay outputs must be controlled via safe digital outputs (e.g., the outputs of modules 75x-667/000-004, 750-1665/000-004, ...). In addition, a non-safe enable signal for the relay outputs must be provided via the process image. The status of the safe relay outputs and the temperature of each relay are recorded and transmitted to the controller via the non-safe process image, where they must be evaluated as diagnostics. The field level and system level are electrically isolated from one another. Individual safety modules can be arranged in any combination when configuring the fieldbus node. This module (Item No. 750-1689) was evaluated by UL to UL/CSA 61010-1, UL/CSA 61010-2-201, UL 121201, and CSA-C22.2 No. 213. The functional safety evaluation was performed by TÜV Rheinland in compliance with the specified standards.
