FEATURES
1-9
Hardware
and Installation User Manual
1.2.3 Communication
Ports
Each TI525/TI535 PLC has a 25-pin RS-232-C/RS-423 compatible port
configured as Data Terminal Equipment (DTE). This port may be used for
communicating with programming equipment such as the Timer/Counter
Access
Module (TCAM), the VPU, a CVU, or a modem up to 50 feet
(15 m) away
.
An RS-422 compatible port is also available on the PPX:535–1212. This port
may
be used for communicating with a modem and allows communication to a
distance up to 1000 feet (305 m).
1.2.4
Battery Backup
A
3.0 V lithium battery (PPX:2587678–8005) protects
the following information
during
a power cycle:
D
RLL program
D T
imer/counter preset and current values
D
Drum preset preset and current values
D W
ord I/O values
D V
ariable (V) memory values
D
Retentive control relay status
D
States of forced I/O
D
Scan time
D
I/O Configuration data
Battery memory backup typically lasts six months at temperatures ranging
from
0
_
to 60
_C.
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