Model: IS410TRLYS1B
Product Name: Mark VIeS Relay Output with Coil Sensing
Contact Ratings
• 0.6 A at 125 V dc
• 1.2 A at 48 V dc
• 8 A at 24 V dc
• 3 A at 120 / 240 V ac
Number of Channels:
12 Form-C relays (12DO)
I/O Pack IS420YDOAS1B (qty 3 or 1) (order separately)
I/O Pack Redundancy: Simplex or TMR
Contact Input Module
The Mark* VIeS Functional Safety Contact Input module provides an interface between
discrete contact process sensors (24 discrete inputs) and Mark VIeS Safety control logic.
The Contact Input module consists of two orderable parts: the contact input I/Opack and
the contact input terminal board. All safety contact input modules use the same I/Opack,
IS420YDIAS1B. Multiple DIN-rail mounted terminal boards are available to provide the
necessary contact voltages, redundancy, and terminal block styles.
The Contact Input module is available in both Simplex and Triple Modular Redundant
(TMR) configurations. Users can select the configuration that best addresses their needs
for availability and SIL level. This document discusses the Simplex Contact Input (STCI)
terminal board and the Contact Input (TBCI) terminal board. The TBCI terminal board
offers TMR capability but it can also be used in a Simplex configuration with a single
YDIA I/Opack. In a TMR I/Oconfiguration, the controller performs 2-out-of-3 voting on
the discrete inputs. In a Dual I/Oconfiguration, the controllers listen to the first reporting
YDIA I/Opack (no voting
