Hardware reference guide

Intelligent/Special Purpose

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35013379 11/2011

Command 4 Response Format

The following figures show the counters for 3X through 3X+5 for command 4.

I/O Map Status Byte

The most significant bit in the I/O Map status byte is used for the 140EHC20200

High Speed Counter Module. The following figure shows the map status byte

Using I/O Mapped Registers to Operate the High Speed Counter

COUNT UP Example

Field connections for this example are illustrated in the EHC202 wiring diagrams 1–

4 in this section. The maximum allowable Vref value is 30 Vdc. Input pulse on-off

threshold levels for the 5 ... 24 Vdc Vref range are listed in the module specification

table. The minimum differential input is 1.8 V.

The following user logic:

z Configures the module to count up from zero.

z Turns an output on for one count at a setpoint value of 50.

z Continues counting to 100.

z Rolls over to zero and turn on a second output for one count.

z Repeats the operation.