Pepper-computer Modular Computers RS485 Manual do Utilizador descarregar pdf (Página 53)

100

101

SMART I/O User’s Manual

Chapter 2 SMART-BASE

+Vcc (24V)

Gnd (common)

Digital

Input

Low

Pass

Filter

Input

Circuit

Timer I/O

TIN

+Vcc (24V)

Gnd (common)

GATE

Low

Pass

Filter

Input

Circuit

TINGATE

To understand the functionality of the counter/timer, it is necessary to

understand the purpose of TIN, TOUT and TGATE. Figure 2.5.3.1 shows

the block diagram of TIN.

Figure: 2.5.3.1 Timer I/O (TIN) Schematic

The I/O Controller timer is used for the generation of the TOUT and TIN

functions with the three timer I/O lines being fully isolated from the system.

The internal clock of the timer/counter is 6MHz and can be prescaled to

enable lower frequencies as necessary.

With the GATE permanently active (relay closed), every pulse detected on

the TIN line will be acknowledged up to a frequency of 20kHz. Otherwise,

TIN will only be recognized for the duration that the GATE is active.

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Pepper-computer Modular Computers RS485 Manual do Utilizador Página 53

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