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Marsh Bellofram Automatic Timing & Controls 354B Series Solid State Shawnee II High Speed Counter

Marsh Bellofram Automatic Timing & Controls 354B Series Solid State Shawnee II High Speed Counter
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Marsh Bellofram Automatic Timing & Controls 354B Series Solid State Shawnee II High Speed Counter - 1

354B Series Automatic Timing & Controls automatictiming.com 800.727.5646 124 Predetermining Counters // 354B Series The solid-state 354B is manufactured from a series of computer-tested plugin circuit boards and assembled 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 354B’s only significant mechanical component—has a life expectancy of 100,000,000 operations (no load), while the optional solid-state switch module has a virtually unlimited life expectancy. As a result, the 354B achieves an overall reliability that surpasses even the high level achieved by previous Shawnee counters. CYCLE PROGRESS INDICATION: The Shawnee 354B indicating counter provides cycle progress indication on a four-digit display located immediately above the digital setting number wheels. While the non-indicating Model 354B does not provide true cycle progress indication, its pilot light signals when the counter is running. 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 levers up or down. You can change the setting at any time, even during a cycle. NOISE IMMUNITY: The 354B does not have to be shielded: its transformer 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. PLUG-IN AND DUST-TIGHT: All 354B counters feature true plugin design and are dust-tight from the front of panel. 100% ACCURATE AND BOUNCE-PROOF: The repeat accuracy of the Shawnee 354B is 100% at all rated speeds, even in the presence of contact bounce. The 354B has two selectable levels of bounce suppression: a normal level which eliminates false counts at speeds up to 500 per second with reed switch inputs, and 5,000 per second with DC voltage pulses; and a high level, for speeds up to 80 per second with high-bounce contact closures (relays, precision switches, etc.). HOUSING, IT OCCUPIES 40% LESS: Packaged in a 72mm2 DINsize housing, the 354B occupies 40% less panel space than previous IC counters. Modern production and assembly techniques have substantially reduced manufacturing costs resulting in a 45% cost saving. CONTROL VERSATILITY: The 354B operates either as a repeat cycle pulse generator or in single-cycle interval or delayed mode. You choose the kind of control action you want by installing jumpers on the terminal block. It also provides a choice of control output, a standard plug-in SPDT relay or an optional SPST solidstate switch module...plus an independent and separate DC output signal at Terminal 6. The Shawnee 354B operates on a digital logic circuit with three main elements: input circuits which allow it to count various types of DC pulses; 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 input circuit and ROM. When the start (ready/reset) signal is on, the input circuit begins to count incoming pulses, feeding the total count continuously to the comparator. When input circuit output exactly equals ROM output, the 354B counts out. At that instant, the input circuit automatically turns itself off even if the start signal remains on; it is therefore not necessary to turn off the pulses externally. At the same instant, the 354B provides one of three load control actions depending on how it is wired (see Typical Applications). When the 354B is wired for interval operation, the counter’s output device (either the standard SPDT relay or the optional SPST switch module) is energized from the start to the end of the count cycle; so is the DC output at terminal 6. S h a w n e e I I Hi g h S p e ed Counter \\\DIMENSIONS (INCHES/MILLIMETERS) MODEL NUMBER >>>>>> 354B 30 P Range 350 Q 30 P X 9,999 Counts 99,990 Counts (units digit blind) 35 Special 000 Voltage & Frequency 120, 50/60 Hz 240, 50/60 Hz R Arrangement With Display (On-Delay) Features Basic plug-in unit Standard unit With solid-state output module J Special K ACCESSORIES 0353-260-27-00: Surface mounting bracket kit 0305-265-61-70: Retrofit kit The 354B Directly Replaces 354A. \\\OPERATION

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Marsh Bellofram Automatic Timing & Controls 354B Series Solid State Shawnee II High Speed Counter - 2

800.727.5646 automatictiming.com Automatic Timing & Controls 354B Series Predetermining Counters // 354B Series 125 When the 354B is wired for delayed control, the output device is energized at the end of the cycle and remains on until the counter is reset; so is the DC output. When the 354B is wired as a repeat cycle pulse generator, the output device and the DC signal are both off until the end of the count cycle, at which time they are both on for about 80 mSEC From the instant that the output pulse comes on, the 354B stops counting for 500 ìSEC while it resets; it automatically begins a...

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Marsh Bellofram Automatic Timing & Controls 354B Series Solid State Shawnee II High Speed Counter - 3

354B Series Automatic Timing & Controls automatictiming.com 800.727.5646 126 Predetermining Counters // 354B Series The Shawnee 354B has a readily accessible 16-point terminal which allows its use with a variety of start circuits and input pulses and to program it for the desired load action. To wire the 354B so as to suit a particular application is a relatively simple matter that is easily accomplished by selecting one of the examples in each of the following four steps. Combine the four examples for your wiring diagram. STEP 1 - START CIRCUITS The 354B accommodates three types of start...

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Marsh Bellofram Automatic Timing & Controls 354B Series Solid State Shawnee II High Speed Counter - 4

800.727.5646 automatictiming.com Automatic Timing & Controls 354B Series Predetermining Counters // 354B Series 127 STEP 3 - PULSE INPUTS The 354B can count from low or high-speed contacts or, by virtue of its built-in pulse shaper, from DC voltage pulses of positive or negative polarity. Choose the wiring diagram that suits your application. A. LOW-SPEED CONTACTS. The 354B counts input pulses from precision switches, relays, limit switches, etc., at speeds up to 80/SEC. B. HIGH-SPEED CONTACTS. Input pulses from low-bounce contacts, reed switches, etc., can be counted at speeds up to...

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