Honeywell 900U02-0100 - Hardware and Wiring Requirements for Safety Configuration; Figure 37 - IO-V Function Block Connections

Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 67
May 2019
4.11. Hardware and wiring requirements for safety configuration
For the function blocks for safety a special hardware configuration and wiring is required.
Below high level diagram explains the wiring concept for using the validation function blocks.
Figure 37 - IO-V function block connections
Figure 38, Figure 39, and Figure 40 demonstrate the connection of a series output relay’s normally OPEN
contact to protect against outputs that are stuck “ON”. This relay may be added individually as shown in
Figure 38 and Figure 39 or common for multiple channel outputs as shown in Figure 39 and Figure 40.
The series output must be configured to operate when the DO-V’s or AO-V’s Fail pin or VFail pin goes
“ON”.