Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 145)

Digital Modules

08 Jan. 98

SMART I/O User’s Manual

Page 4 - 59Manual ID 09901, Rev. Index 0500

Downstream the optoisolation part of the circuit, an RC first-

order, low-pass filter converts signals greater than 40 Hz into

logically suitable values before they enter the system’s digital

input.

The LED driver activates the relevant LED when the input

increases to more than 30 V AC.

As previously mentioned, the last channel is capable of issuing

INTx interrupts, when enabled by software. This interrupt will

only be acknowledged under OS-9, if the module is on the

SMART-BASE, or occupies the first slot of the attached

SMART-EXT unit. This channel is manufacturer-set at 40 Hz,

but other frequencies may be catered for. The table below shows

the settings of the solder jumpers for this filter configuration.

4.4.6Configuration

Although two solder jumpers (J3 and J4) exist on the board, they

should remain at their manufacturer settings unless a user-spe-

cific filter is required, that for instance cuts off at higher fre-

quencies. If a user-specific filter is required, then contact please

PEP Modular Computers for any further advice, and refer to the

diagram of the filtering components shown in figure 4-5.

Table 4-2: Jumper Settings

Jumper Settings

Description

J3 1-2

1-3

Standard input filter 40 Hz

Customer-specific input filter

J4 1-2

1-3

Standard input filter 40 Hz

Customer-specific input filter

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 319 320

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Pepper-computer Modular Computers RS485 Bedienungsanleitung Seite 145