ALLEN BRADLEY 1747-L551 PLC Processor

Troubleshooting
10–21
Identifying Processor
Errors while Downloading
an Operating System
The download process of the operating system by the SLC 5/03,
SLC 5/04, and SLC 5/05 processors takes approximately 45 seconds.
While the download is in progress, the RUN and FLT LEDs remain
off. The other four LEDs — RS232, DH485 (DH+ on the SLC 5/04
and ENET on the SLC 5/05), FORCE, and BATT — turn on and off
in a walking bit sequence. If the download is successful, these four
LEDs remain on together.
!
ATTENTION: Jumper J4, located on the bottom
corner of the motherboard, provides write protection
from any download of a new operating system. The
“out of the box” position of this jumper is
“PROTECT,” or write protect. Without the jumper, the
processors are write protected.
Catalog and Serial
Number Label
Place the operating
system upgrade
label here.
SLC 500
PROCESSOR UNIT
CAT SER FAC
SERIAL NO.
PROC. REV.
PLACE OS UPGRADE LABEL HERE
OPERATING SYSTEM INFO
OS # SER FRN
PROTECT
WHITE + 1
RED -
3
PROGRAM
BATTERY J4
CURRENT REQUIREMENTS:
® U LISTED IND. CONT. EQ.
L FOR HAZ. LOC. A196 SA ®
CLASS 1, GROUPS A, B, C AND D, DIV. ÎÎ2
OPERATING TEMPERATURE CODE T3C
1A @ 5 VDC
200mA @ 24 VDC
MADE IN USA
The SLC 5/03, SLC 5/04, and SLC 5/05
processors are protected from the
operating system download when jumper
J4 is in this position:
Daughter Board
OR
The SLC 5/03, SLC 5/04, and SLC 5/05
processors accept the operating system
download when jumper J4 is in this
position:
Operating System
Upgrade/Memory
Module Socket
Mother Board
Jumper J4
Publication 1747-6.2