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The High Speed Counter module, catalog number IC693APU300, for the Series 90-30 Programmable Logic Controller (PLC) provides direct processing of rapid pulse signals up to 80 kHz for industrial control applications such as:
Turbine flowmeter
Meter proving
Velocity measurement
Material handling
Motion control
Process control Direct processing means that the module is able to sense inputs, process the input count information, and control the outputs without needing to communicate with a CPU. The High Speed Counter uses 16 words of input memory. This consists of 16 bits of discrete input memory (%I) and 15 words of analog input memory (%AI). These inputs are updated once per CPU sweep. The High Speed Counter also uses 16 bits of discrete output memory (%Q) which are transferred once per sweep. The High Speed Counter is configured using the Series 90-30 Hand-Held Programmer or the Logicmaster 90-30 Programming Software Configurator function. Many features can be configured from the user’s application program as well. Each feature is set to a factory default configuration which is suitable for many applications. There are no jumpers or DIP switches to set on the module. Two green LEDs at the top of the module indicate the operating status of the module and the status of configuration parameters. 1 1-2 Series 90 -30 High Speed Counter User’s Manual – June 1995 GFK-0293C Configurable Counter Types When the module is configured, a counter type must first be selected. The choices are:
Type A - selects 4 identical, independent simple counters
Type B - selects 2 identical, independent more complex counters
Type C - selects 1 complex counter Type A Configuration When used in this basic configuration, the module has four identical programmable up or down 16-bit counters. Each counter can be programmed to count either up or down. Each has three inputs: a Preload input, a Count Pulse input, and a Strobe input. In addition, each counter has one output, with programmable on and off Output Presets. Type B Configuration In its Type B configuration, the module has two identical bidirectional 32-bit counters. The count inputs may be configured to accept Up/Down, Pulse/Direction, or A Quad B signals. For a Type B counter configuration, each counter has two completely independent sets of Strobe inputs and Strobe registers. Each counter also has two outputs, with each output having programmable on/off Presets. A Disable input can be used to suspend counting. Type C Configuration In the Type C configuration, the module has one 32-bit counter with four outputs, each with programmable on/off output presets, three strobe registers with strobe inputs, and two Preload values with Preload inputs. In addition, the module has a Home Position register for preloading the Accumulator to the Home Position value. Two sets of bidirectional counter inputs can be connected to operate in a differential fashion. Each set of inputs can be configured for A Quad B, Up/Down, or Pulse/Direction operation. The Type C configuration is suitable for applications requiring motion control, differential counting, or homing capability. Description of Module Additional module features include:
12 positive logic (source) inputs with input voltage range selection of either 5 VDC or 10 to 30 VDC
4 positive logic (source) outputs
Counts per timebase register for each counter
Software configuration
Internal module diagnostics
Individual LEDs that provide a visual indication of Module OK and Configured OK status
A removable terminal board for connection of field wiring Inputs can be used as count signals, direction, disable, edge-sensitive strobe, and preload inputs depending on the counter type selected by the user. Outputs can be used to drive indicating lights, solenoids, relays, and other devices.