Mitsubishi Electric C70 Connection Manual page 62

Names of parts
(1) LED:
Shows the input signal state of PLCIO.
(2)Module No. sticker:
Module Nos. (1 to 3) should be written on this sticker when multiple dual signal modules are mounted.
(3)
89.3
C70 Connection Manual
2.7 Dual Signal Module
[mm]
(1)
(2)
(4)
27.4
43