IDEC HR6S Manual page 4

Connect to Various Input Devices
Dials are used to select input devices and start functions to enable safety measures for a wide variety of machines
and allows standardization of the relay module.
4
Setting a start function
Select from 8 types of start functions without changing the wiring.
Automatic and manual operation can be selected as well as "startup
test", which requires monitoring, cross-circuit detection, and pre-start
inspection.
(For details, see page 31.)
Setting an application function
Set up to 7 types of input devices, such as emergency stop switches,
interlock switches, light curtains, RFID devices, magnet switches,
proximity switches, two-hand control switches, and pressure-sensitive
switches.