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4. Functions

SMC-4DF-PCI, SMC-8DF-PCI

Encoder input signal

Phases A, B and Z are available to this product for encoder input. The signals that can be connected are

those in the following output forms: the line driver output form, the TTL level output form, and the

open-collector output form.

The specifications for the input pulse that can be set are as follows:

- 2-phase Input, Multiply by 1

- 2-phase Input, Multiply by 2

- 2-phase Input, Multiply by 4

- Single-phase Input, Multiply by 1

2-phase Input

Two-phase input is a pulse input consisting of two phases between which there is a phase difference of

90° : Phase A (leading signal) and Phase B (trailing signal). The minimum phase difference between

Phase A and Phase B should be set to 0.2μ sec for line driver output connection, to 0.34μ sec for TTL

level output connection or to 1μ sec for open-collector output connection.

U : Up Count

D : Down Count

Multiply by 1

Multiply by 2

Multiply by 4

Multiply by 1

Multiply by 2

Multiply by 4

Figure 4.2. Sample Count for Two-phase Input Setting

Single-phase input

In single-phase input, the counter counts up at the rising edge of Phase A (UP) pulse and counts down at

the rising edge of Phase B (DOWN) pulse.

A count cannot be performed properly, if Phase A (UP) pulse and Phase B (DOWN) pulse are generated

at the same time.

U : Up Count

D : Down Count

Figure 4.3. Sample Count for Single-phase Input Setting

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 74 75

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Carrier 8DF-13 Guida Utente Pagina 56