Specifications

2-28
based on a user defined SATURATION RATE (Vehicles per
Hours, VPH) and a PERCENT OF SATURATION, the result
of which is a TOTAL VOLUME. As an option, it is also
possible to simulate speed (with a user definable pulse
width) and waiting vehicle queue. Sixteen of the simulated
detectors can be assigned to outputs to provide inputs to
another controller or external device without detector
simulation.
GENERAL COORDINATION OUTPUTS
The following outputs relate to coordinated operation -
regardless of the mode (TBC, FSK comm, or Interconnect).
Circuit 13
This is the "system" (coord) output which is independently
programmed. When system is in the clock mode and CKT
13 is on, a call for coordinated operation is in effect.
SYSTEM
This output becomes active after the system command
becomes active and the first valid sync pulse has been
received. The cycle timer with associated permissives and
force offs will take effect. System output will remain on,
even if sync pulses are not received, unless:
1. Sync pulses are lost and the LMD is programmed for
“Loss of sync pulse to free” and thus goes free.
2. The call to free (system override) input is grounded.
3. The system command becomes Inactive.
4. The cycle, split, offset to free combination is active.
5. The unit is manually programmed for free operation.
6. The pre-emption, manual control enable, or remote
flash inputs are activated.
7. There is a loss of FSK communications (if used) and
there Is no back-up clock plan calling for system
(clock is the back-up mode to FSK communications).
Note that depending on the mode (see time clock coordi-
nation outputs) system out (and coordination) can be de-
termined manually, by Interconnect, FSK communications,
or time clock circuit 13.
System out may be used to call for a specific function to be
implemented during coordination such as INHIBIT MAX.
Note that MAX II or CNA may be Internally programmed for
system operation without need for external wiring. Either
Inhibit Max (system out) or MAX II (internally programmed)
are often implemented during coordination so that phases
are terminated by force off’s, not max’s.
COORDINATION CLOCK CKTs 1-8,13
These clock circuit outputs are primarily used when the
LMD is operating as a master, driving a hard wired
interconnect. The controller will also internally respond to
time clock coordination commands when these
functions are programmed in the time clock mode
and system (CKT 13) is called for.
Cycle 2,3 Out (Ckt 1,2)
Activity of these outputs is determined by time clock
selection of Cycle. Activity of these outputs in
relation to the selected cycle is as follows:
Coord Plan Cycle CKT # 1 CKT # 2
Cycle 1 or 5 OFF OFF
Cycle 2 or 6 ON OFF
Cycle 3 or 7 OFF ON
Cycle 4 or 8 ON ON
Notes:
-When a new cycle is called for, the actual cycle
output circuits immediately change states but the
cycle timer finishes the current cycle before starting
the new cycle.
-The cycle outputs follow the clock only or the
general selection of cycle (regardless of mode),
depending on the Coord Out setting (MM-2-4-2).
-Cycles 1-8 can be selected by CL master or TOD
day plan. Cycles 1-4 only are selectable by
interconnect.
Time clock Offset 1,2,3 Out
Activity of these outputs is determined by time clock
programming, specifically the offset portion of the
coordination plan (there are no offset 4, 5 outputs).
Sync pulses are automatically issued once per cycle
on the active offset based on the active cycle. When
the interrupter mode is in effect, four interrupter
pulses are issued in addition to the master sync
pulse at a rate of (cycle length – 2)/4.
Note that offset outputs are equivalent to the master
sync pulses and do not reflect the local offset. The
local offset timing is internal to the controller. Thus,
the beginning of the local cycle should be offset
from the offset outputs by the offset value.
Split 2,3 Out (Ckt # 6, 7)
Activity of these outputs is determined by time clock
programming, specifically the split portion of the
coordination plan. Activity of these outputs in relation
to the selected split is as follows:
Coord Plan Split Ckt 6 Ck 7
Split 1 OFF OFF
Split 2 ON OFF
Split 3 OFF ON
Split 4 ON ON