2
BLOCK DIAGRAM/OVERVIEW
COUNT SCALER
Receives the up or down signals and adds or subtracts the
scale factor value to/from the current scaler remainder. The
scaler outputs the integer result as up or down pulses. The
fractional portion of a count remaining is stored in the scaler’s
memory.
COUNTER
Counts the up and down pulses from the scaler. Every two
milliseconds, the counter checks if its value has passed
through the preset value (coincidence). For coincidence to
occur, the counter must count up to the preset in the reset to
zero mode and count down to zero in the reset to preset
mode. If coincidence has occurred, the main counter outputs
a pulse on the preset output. The main counter counts in the
opposite direction if it is programmed to reset to preset.
PROGRAMMABLE INPUTS
The Ambassador unit has five programmable inputs (RST/
CLR key and four terminals). The user may program each
input for one of six functions (see INPUTS, page 10).
RELAY AND TRANSISTOR OUTPUT LOGIC
These blocks act like latching relays. When the pick-up input
receives a pulse, the output turns on and stays on until it times
out or until the dropout input receives a pulse.
RATE METER BLOCK
The Rate Meter Block measures the time duration of a pulse
or group of pulses received at input A. It uses this measure-
ment along with the rate scaler to calculate the rate in
meaningful units. Internal logic resets the rate meter if the
count direction reverses.
Count
Signal
From
Sensor(s)
COUNT
SCALER
COUNTER
RATE METER
(Rate Scaling)
Pick
Up
Drop
Out
Pick
Up
Drop
Out
RELAY 1
OUTPUT
LOGIC
TRANSISTOR
2 OUTPUT
LOGIC
R1
T2
Preset
Pick
Up
Drop
Out
T1
TRANSISTOR
1 OUTPUT
LOGIC
Inp 1
Inp 2
Inp 3
Inp 4
R/P
C
RST
CLR
