EMS-94072N page 7 of 8
Identifying Circuit Board Configuration
Should it becomes necessary to identify your EMS448 circuit board
configuration, undo the two latches/screws and open the EMS448 case.
Within, you will find the EMS448 circuit board (EMS448 board does
not include terminal blocks).
The EMS448 circuit board configuration designation is controlled by
several factors: (see the call-outs on schematic below)
The Program Chip is labeled with your Program Number, Version, Date
and Checksum.
LK1 information
(Input/Output configuration)
LK 1 determines your input/output configuration (see LK1 call-out
below). When placed in the IN position, it enables a 4th digital input and
disables the 7th digital output.
When placed in the OUT position, it disables the 4th digital input and
enables the 7th digital output (see specifications section, on page 2).
LK2 information
(configuring analog inputs 0-7)
LK2
is used to configure analog inputs 0 through 7 for a particular
program. The choices are: resistive
*
type sender / digital, 4-20 mA or
0-5 VDC. The following is based on orientating the board with the
DB25 connector on the bottom. Putting the shunt across the bottom and
middle pins, configures the analog input for either a resistive type sender
or a
ground only
digital. Across the middle and top pins configures the
analog for a 4-20 mA. Leaving the shunt off, configures the analog for a
0-5 VDC. To display battery VDC, or if the program uses a resistive
type sender on any of the analogs, such as a Murphy ES2P analog 0
becomes not available and must have the shunt in the sender/digital
position. Use only
two wire
senders and run both wires back to the
EMS448, one to ground and one to the input. The EMS448 program
used must support the way the analogs are configured.
*
Analog 0 has choices: Battery Monitor/ digital/ 4-20 mA /0-5 VDC.
EMS448 CIRCUIT BOARD
Processor
Chip
RAM Chip or
Clock/RAM Chip
Program chip
with Label
WARNING:
DISCONNECT ALL ELECTRICAL POWER AND STOP ALL MACHINERY BEFORE OPENING
THE EMS448 ENCLOSURE. IT IS YOUR RESPONSIBILITY TO HAVE A TRAINED PERSON OR A QUALIFIED
TECHNICIAN HANDLE AND/OR TROUBLESHOOT THE EMS448 CIRCUIT BOARD.
LK2 information
see above.
LK1 information
see above.
