Applications
GARD 8000 SYS RFL Electronics
May 1, 2013 2-22 973.334.3100
that comms head. For example, if two 64 kbps data channels are to be used the data rate at the GARD
is 128 kbps, and at the customer interfaced equipment it is 192 kbps (‘n’ value of 3). Framing is
required so that each individual channel can be identified, when more than one channel is used.
2.6 SYSTEM SEQUENCE OF EVENTS RECORDING (SOE)
The GARD 8000 is supplied with a Sequence of Events Recorder (SOE). Up to 512 events are
recorded, and time stamped with a 1 ms resolution.
2.7 INPUT/OUTPUT MODULES
Inputs and outputs are selected in blocks of six. A communications board can accommodate one block.
Additional inputs and outputs are mounted on another rear board; each board can hold two sets of six,
in any combination. The block versions are:
6 opto-isolated inputs
6 solid state outputs
6 relay outputs
The inputs and outputs are provided with screw terminals, and have two independent terminals for
each input or output.
The 6U chassis can accommodate up to 10 boards with comms/input/outputs and a 3U chassis can
house up to 4. Note that a protection module, digital fault recorder; and Power Line Carrier module,
will each require one or more rear slots for its analog I/O’s.
2.7.1 OPTO-ISOLATED INPUTS
The inputs are arranged in groups of six electrically independent opto-couplers. A group of six is
mounted on the upper and/or lower part of a rear board in the 6U chassis or left/right side on the 3U
chassis. A communications module can accommodate one group of six inputs. Discrete I/O modules
can comprise two input groups or one input and one output group.
The inputs are polarity independent. The terminals are numbered from left to right, top to bottom in the
6U chassis. In the 3U chassis, the same type of board is mounted horizontally so marking is read from
right to left.
The inputs are jumper selectable for input voltage 24 Vdc, 48 Vdc, 125 Vdc or 250 Vdc.
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