62 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
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 33 - IO-V function block connections
Figures 34, 35, and 36 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 34
and 36 or common for multiple channel outputs as shown in figure 35 and 36. The series output must be
configured to operate when the DO-V’s or AO-V’s Fail pin or VFail pin goes “ON”.
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