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22 Description

Description

Fig. 22-1 Functional diagram

Display and

Motherboard

Power supply card

Interfaces

re

ye

gn

NVRAM

MOD

STEP

EPROM1

A/D- con- verter

EPROM2

RAM

D/A- con- verter

Display Controller

Clock

LC - Display

Processor

I=const.

ERR

binary output

AB1

GW1 GW2

NAMUR input

ENI

binary inputs

EB1 EB2 EB3 EB4

MUX

E1 E2 E3 E4 E5 E6

A1 A2

I

K

The Measuring Computer TZA 401 is composed of the mother-board and mains card. The I/O extension card featuring addition-al inputs and outputs can be installed as an option.

Analog signals, e.g. current, voltage, resistance, can be connected to inputs E1...E6. Instead of analog inputs E5 and E6, four binary inputs EB1...EB4 can be selected, for example for pulses and binary states.

A/D- con- verter

EX1 EX2

binary inputs

EBXa EBXb

EBX1 EBX2 EBX3

D/A- con- verter

AX1 AX2

binary outputs

ABXa ABXb

ABX1 ABX2 ABX3

Two supplementary analog inputs, EX1 and EX2, are si- tuated on the I/O extension card; only the same type of input signals may be con- nected to these two inputs, e.g. two current, voltage or resistance signals. This card also features two additional analog current outputs AX1 and AX2 as well as diverse binary inputs and outputs.

All motherboard input si- gnals are processed digitally acc. to the computation algo- rithm programmed. The re- solution of the A/D converter on the motherboard is ±3600 digits. The resolution of the A/D converter on the I/O extension card is ±16 bits. The floating point arithmetic operates with eight digits. U ... U I I=const. LN S1 S4 KX I/O - extension module Z - 17623 EN

transmitter supply

Power supply unit

EEPROM

Port exten- sion

The processor controls the display and the real-time clock via the display controller. The NV- RAM is used for data storage in the event of power failure. The „MOD“ and „STEP“ keys are used for changing the display and for selecting the measured variables, device data and pa- rameter data.

Up to four two-wire transmitters can be powered with the transmitter power supply US1...US4 (Imax. = 25 mA).

The inputs on the motherboard are isolated from each other and from the system zero by means of an electronic potential separation up to ±10 V. The potential separation is ±4 V on the I/O extension card.

The operating data and calibration data are stored in EPROM1, while EPROM2 contains one or more computation programs with the relevant parameter files. Each of the two EPROMs can accommodate a capacity of 32 KB.

The computation program loaded in the EPROM is started on switching on the power sup- ply. The program interrupts the processing operation in the event of power failure; an auto- matic restart is effected on voltage recovery.

Device-specific calibration of the inputs and outputs is performed at the factory.

Please consult Configuration Instructions 42/18-51 EN for more information on the hardware and software.

23

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