Rockwell Automation 1772-LV,D17726.6.1 A and I MNL MINI-PLC-2/15 PROCESSO - Manual (Page 12)

Controller Components
Chapter 2
2Ć7
Optional Power Supply Source
It is permissible to use the 1771-P2 Auxiliary Power Supply in place of the
1771-P2 System Power Supply. It should be noted, however, that RAM
memory will be lost if an AC power loss occurs. One of two cables is used with
this power supply:
1771-CE Power Cable (1 ft/30.5 cm)
1771-CD Power Cable (5 ft/1.5 m)
The I/O Chassis is the compact, slotted until that houses the Mini-PLC-2/15
Processor Module and the I/O Modules. There are three I/O Chassis sizes
available (Figure 2.4):
32 I/O Chassis (Cat. No. 1772-A2), containing 4 I/O Module slots
64 I/O Chassis (Cat. No. 1771-A2), containing 8 I/O Module slots
128 I/O Chassis (Cat. No. 1771-A4), containing 16 I/O Module slots
Each I/O Chassis is able to fit into a working enclosure eight inches deep.
I/O Chassis are designed to permit Controller expansion. If a 32 I/O or 64 I/O
Chassis is used and more I/O points are needed, a larger Chassis can be installed
without rewiring. User wiring is connected to Field Wiring Arms which can be
removed from the smaller Chassis and snapped onto the corresponding positions
of the larger Chassis. Also, when Field Wiring Arms and I/o modules are
placed in corresponding slots on the larger Chassis, the originally programmed
addresses of the user I/O device are still valid and need not be changed.
The backplane of the Chassis has sockets for each module, a socket for Power
Supply connection and a Switch Group Assembly for determining output
response to a fault. latches on top of the Chassis snap down to hold the modules
securely in place and provide labeling for module identification.
Shipped standard with each I/O Chassis are a number of Field Wiring Arms
(Cat. No. 1771-WA), one for each I/o Module slot. If special Field Wiring
Arms are required, they are shipped with the I/O Module. In addition, a
package of plastic Keying Bands (Cat. No. 1777-RK) is shipped with each I/O
Chassis. The Keying Bands provide an easy method for the user to key an I/O
Module slot to accept only one type of I/O Module. use of these keying bands
is strongly recommended.
I/O Chassis