ATC-Automatic Timing & Control 356C Series Data Sheet

E48329

Shawnee II Digital Counter

A compact version of the 336 counter, the ATC 356 is its exact func-
tional duplicate. Packaged in a 72mm2 DIN-size housing, it occupies
40% less panel space and costs proportionately less. Modern pro-
duction and assembly techniques have all but eliminated hand wiring,
enhancing the reliability and life expectancy of the 356.

FAST, ACCURATE AND BOUNCE-PROOF: The repeat accuracy of the
356 is 100%. It maintains full accuracy even at pulse rates up to
4,000/minute, even with pulses that are as brief as 1 millisecond, and
even in the face of severe contact bounce, which it ignores by virtue
of an extremely effective anti-bounce circuit.

EASY TO SET AT ALL TIMES: The Shawnee counter is easily and
accurately set even with work gloves on. Push any of its four toggle
levers in any sequence until the number you want appears above it.
You can decrease as well as increase each number by pushing the

PREDETERMINING COUNTERS 356C Series

levers up or down. You can change the setting at any time, even dur-
ing a cycle.

PLUG-IN AND DUST-TIGHT: All 356 counters feature true plug-in
design and can be replaced in seconds without disturbing the housing
or disconnecting the wiring. The dial assembly is gasketed so that the
counter body is dust-tight from the front of panel.

CYCLE PROGRESS INDICATION: The Shawnee 356 indicating counter
provides cycle progress indication on the four-digit display located
immediately above the digital setting number wheels. When the
counter is in the reset condition, the VFD display is blank. During
the cycle, the display counts up from 0, thus always indicating the
number of counts that have elapsed since the start of cycle. At count-
out, the display shows the total elapsed count and thus equals the
numbers on the digital setting wheels.

COMPUTER-TESTED RELIABILITY: The solid-state 356 is manufac-
tured from a series of computer-tested plug-in circuit boards and as-
sembled virtually without hand wiring. Because it has no moving parts
in its logic circuits, its life expectancy is practically unlimited. Even the
load relay – the 356’s only significant mechanical component – has a
life expectancy of 10,000,000 operations (no load). As a result the
356 achieves an overall reliability that surpasses even that achieved
by previous Shawnee counters.

NOISE IMMUNITY: The 356 does not have to be shielded: its trans-
former power supply, full-wave bridges, buffered logic and other
design characteristics render it immune to the electrical noise that is
sometimes encountered in industrial environments thus eliminating
false starts and reset due to voltage spikes.

SAVE 40% IN PANEL SPACE AND COST: Packaged in a 72mm2 DIN-
size housing, the 356 occupies 40% less panel space than previous IC
timers. Modern production and assembly techniques have substantially
reduced manufacturing costs resulted in a 45% cost saving.

LOW INVENTORY COSTS: Each Shawnee 356 covers the active count
range of 1 to 9,999, easily satisfying the vast majority of industrial
requirements and thus greatly reducing inventory.

DIMENSIONS (INCHES/MILLIMETERS)

MODEL NUMBER

MODEL NUMBER 356C 30 P

RANGE

9,999 Counts 350
99,990 Counts (units digit blind) 353
Special 000

VOLTAGE & FREQUENCY
120 VAC 50-60 Hz Q
240 VAC, 50-60 Hz R

ARRANGEMENT

With Display (On-Delay) 30

FEATURES
Basic plug-in unit P

Standard unit X
Special K

ACCESSORIES
Surface mounting bracket kit 0353-260-27-00
Retrofit kit 0305-265-61-70

The 356C Directly Replaces 356B & 356A.

Automatic Timing & Controls

OPERATION

The Shawnee 356 operates on a digital logic circuit with three main
elements: a pulse circuit; a read-only-memory (ROM) whose output is
set by the counter’s digital setting number wheels; and a comparator
that continuously examines the outputs of the pulse circuit and ROM.

When power is applied (start signal on), two things happen simulta-
neously; the instantaneous DPDT relay is energized transferring both
sets of contacts, and the pulse circuit begins to count each input
pulse whose duration is at least 1 millisecond. The pulse circuit accu-
mulates the count and feeds the total continuously to the comparator.
When pulse circuit output exactly equals the output of the ROM, the
comparator causes the 356 to count out.

At this point, (1) the DPDT delay relay is energized, immediately
transferring both sets of contacts and (2) the pulse circuit turns itself
off automatically. Since the pulse circuit stops counting even if the
start signal remains on, it is not necessary to tie up one of the 356’s
delayed contacts to do this job.

To reset the 356, power must be removed from terminal 1 (L1) for 75
milliseconds or more. The 356 operates in the on-delay mode only,
always resetting whenever there is a power outage and starting a new
cycle when power is restored.

Switching Sequence*

RELAY CONTACTS Before During End of
Start Timing Cycle

Instantaneous 14-9/6-8
14-10/6-7

Delayed (D2) 11-12/4-5
11-13/4-3

*Assumes a sustained closed start signal (i.e. longer than
the setting on the digital display)

BLACK– CIRCUIT CLOSED

GRAY– CIRCUIT OPEN

WIRING

TERMINAL WIRING:

INDICATING MODEL

SPECIFICATIONS

RANGE 1 to 9999 counts or 10 to 99,990, presettable

in 10 count increments.

COUNT INPUT 2300/MIN with 1:1 on-off time
4000/MIN with 1 mSEC on: 13 mSEC off
500/MIN with 20 mSEC on and 100 mSEC off
Wired for count and repeat operation
Min. Pulse ON Time: 1 mSEC
Min. Pulse OFF Time: 13 mSEC
Ready-To-Count 10 mSEC after application of
Time power to terminals 1 and 2
Bounce Immunity 6 mSEC
(max. bounce open time)
Pulse Contact Req. 30mA (at line voltage)

CYCLE PROGRESS 4 digit, 0.3 inch, high intensity, blue display.
INDICATOR
REPEAT 100%
ACCURACY

RESET TIME 75 mSEC minimum

MINIMUM 1 count
SETTING

COUNT Single Cycle interval or delayed
CONTROL MODES Repeat Cycle pulses

LOAD RELAYS Number two, one instantaneous and one

delayed; both plug-in, DPDT
Operate Time 20 mSEC max.
Release Time instantaneous –20 mSEC, max.
delayed–75 mSEC, max.
Contact Rating 5A at 120 VAC.
2A at 240 VAC,

0.1A at 125 VDC
Life 100 million operations (no load.)

TEMPERATURE 32° to 140°F (0° to 60°C)
RATING

POWER 120V 95-132V at 50 or 60 Hz
REQUIREMENTS inrush -0.4A

running —0.08A
240V 190-264V at 50 or 60Hz
inrush - 0.2A
running—0.04A

TERMINALS 16 screw terminals accessible at rear; integral wiring
diagram on housing.

HOUSING Plug-in design; completely gasketed, dust-tight when
panel-mounted.

MOUNTING Standard Hardware is provided to mount
ACCESSORIES timer so that it is dust-tight

See Accessory from front of panel.
section of catalog Optional Surface mounting without and

with front-facing terminals.

WEIGHT NET: 1 lb., 7 oz. SHIPPING: 2 lbs

PREDETERMINING COUNTERS 356C Series

Automatic Timing & Controls