Rockwell Automation 1770-M12 Mass Storage Systems - Manual (Page 13)

Hardware Features of the Mass Storage
Systems
Chapter 2
2Ć7
Power Switch
This is an on/off switch. We labeled it for international use:
If you select Then power is And POWER indicator is
1 on green
0 off off
Power Connect, 120/220V AC Electrical Card, Fuse Holder J19
This is a multi purpose module. The power connect is where you connect the
power cable to a power source. We describe cables later in this chapter.
The fuse holder houses a 5 A, 250V fuse for 120V operation.
ATTENTION: We ship this product for 120V AC operation. You
must change the electrical card if you are using a 220V AC.
Changing the electrical card protects the mass storage system from
overcurrent and overvoltage. You could damage your equipment if
you do not insert the proper side of the electrical cord.
Chapter 4 describes how to change the electrical card for 220V AC operations.
Baud Rate Switch
Baud is the rate at which communication signals from the 1770–M11 system are
transmitted to the PLC–3 peripheral communication module. The chart below
interprets the three positions on this switch labeled BAUD RATE:
Position For Communication Rate
1 57.6kbaud for 10,000 feet (max)
2 115.2kbaud for 5,000 feet (max)
3 230.4kbaud for 200 feet (max)
Notice that the faster the communication rate, the shorter the distance over
which the device can communicate.
Fan and Filter Location
An internal fan circulates air to cool the mass storage system.