27
1, 2, 3...
1.
I/O Unit Lock Notch
The lock notch fits into the Backplane to hold the Unit in place.
2.
Nameplate
The nameplate shows the model number of the I/O Unit.
3.
I/O Indicators (LEDs)
The indicators show the ON/OFF status of the I/O points. The arrangement
of the indicators varies with the model of I/O Unit, as shown in the following
tables.
4.
Terminal Block
The terminal block is used to wiring I/O. There terminals blocks are remov-
able and consist of two parts.
Appearance
Unit type
Model numbers
8-point Units
ID211, IM211, IA121,
IA221, OC221, and
OA216
8-point Units
F: Fuse burnt out
(with LED)
OD213, OD411, OA221,
and OA223
8-point Units
ALARM indictors
(with LEDs)
OD214
5-point Units
OD223
Appearance
Unit type
Model numbers
16-point Units
ID212, IA122, IA122V,
IA222, IA222V, IM212,
OC225, OC226, OD212,
and OD21A
12-point Units
OC222, OC222V, OD211,
OD217, OA222V, and
OA224
8-point Units
OC224 and OC224V
2-2-7 Group-2 High-density I/O Units
Group-2 High-density I/O Units come in two varieties; C-shape and D-shape.
The shape of the two varieties is the same, but C-shape Units have only one con-
nector, while the D-shape Units have two. C-shape Units have 32 I/O points and
D-shape Units have 64 I/O points.
Group-2 High-density I/O Units can be used with C200H-CPU21/22/23/31 CPU
Racks and Expansion I/O Racks. They cannot be used with Slave Racks.
Units with 10-terminal
Terminal Blocks
Units with 19-terminal
Terminal Blocks
Units
Section 2-2
