A20B-2100-0220 for 16iA, 18iA, 21iA
A20B-2100-0220 or A20B21000220 is a 2 slot back plane PCB commonly used in Fanuc 16i, Fanuc 18i, and Fanuc 21i
Fanuc 16i-A/ 18i-A/ 21i-A Description Manual B-63002EN
Fanuc 16i-A/ 18i-A/ 21i-A Maintenance Manual B-63005EN
Fanuc 16i-MA/ 18i-MA/ 21i-MA Operator's Manual B-63014EN
Fanuc 16i-TA/ 18i-TA/ 21i-TA Operator's Manual B-63004EN
Fanuc 16i-A/18i-A/ 21i-A Parameter Manual B-63010EN
Fanuc 16i-A/ 18i-A/ 21i-A Hardware Connection Manual B-63003EN