RS PRO IIT-2000 - Page 195

IIT-2000/2010/5000/5010 Instruction Manual/English
05/08/2015 Version No. 001 193
interlock signal I/O pins are not shorted (either with the included
interlock key or manually).
This special function is analogous to the “INTERLOCK
OPEN”message that is displayed on the front panel under the
same conditions (page 119).