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serial - Festo Didactic

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8) SETTINGS<br />

The communications interfaces are selected by means of a 3-pin DIP switch on the rear of the module.<br />

One – and only one – switch must be set to ON (down).<br />

ON Active interface Configuration<br />

1 Only V.24 interface Only one module connected to PC<br />

2 V.24 interface and fiber optic First module in ring (PC port)<br />

3 Only fiber optic Extension module in ring<br />

9) PIN ASSIGNMENTS<br />

PORTS<br />

Connector<br />

IEEE488<br />

24-pin socket<br />

Connector<br />

D-Submin<br />

15-pin socket<br />

Digital Analog<br />

PORT 1 PIN PORT 2 PIN<br />

OUTPUT 0 1 OUTPUT 0 1<br />

OUTPUT 1 2 OUTPUT 1 2<br />

OUTPUT 2 3 0V 3<br />

OUTPUT 3 4 (unused) 4<br />

OUTPUT 4 5 (unused) 5<br />

OUTPUT 5 6 0V 6<br />

OUTPUT 6 7 INPUT 1 7<br />

OUTPUT 7 8 INPUT 2 8<br />

INPUT 0 13 (unused) 9<br />

INPUT 1 14 (unused) 10<br />

INPUT 2 15 + 10V REF 11<br />

INPUT 3 16 (unused) 12<br />

INPUT 4 17 (unused) 13<br />

INPUT 5 18 INPUT 3 14<br />

INPUT 6 19 INPUT 4 15<br />

INPUT 7 20<br />

0V DC 11/12<br />

23/24<br />

24V DC 9/10<br />

21/22<br />

POWER SUPPLY<br />

The 24V DC power supply for EasyPort must be<br />

supplied externally and can either be fed via the<br />

ports or via 2 screw terminals located on the rear<br />

of the module.<br />

V.24 – data interface<br />

Connector Sub D 9-pin plug<br />

V.24 = PIN<br />

(unused)<br />

1<br />

Receive data RxD 2<br />

Transmit data TxD 3<br />

(unused)<br />

4<br />

Signal ground SGnd 5<br />

(unused)<br />

6<br />

(unused)<br />

7<br />

(unused)<br />

8<br />

(unused)<br />

9<br />

A commercially available 9-pin <strong>serial</strong> extension<br />

cable can be used for connection to the PC.<br />

1) SYSTEM DESCRIPTION<br />

EasyPort D8A<br />

<strong>Festo</strong> part number 193 930<br />

Data Sheet<br />

(Status 01.2000 Subject to modification)<br />

PROCESS MODELS<br />

Fiber-optic ring<br />

The EasyPort process interface implements bi-directional transmission of process signals between a real<br />

control process using low-voltage technology (24 VDC) and a PC. In order to rule out the possibility of the<br />

process affecting the PC, only electrically isolated interfaces (optocouplers or optical fibers) are used for data<br />

transmission between the individual EasyPort modules or the PC.<br />

Up to 8 EasyPort modules can be connected to a fiber-optic ring. No address settings are required – the system<br />

is self-configuring.<br />

The system is designed and optimised for training purposes, but can also be used outside this environment.<br />

2) FUNCTIONS<br />

The EasyPort D8A basic module has 8 digital and 4 analogue inputs as well as 8 digital and 2 analogue<br />

outputs.<br />

Following power-on test, the module is ready for operation and waits for initialisation by the PC or the<br />

upstream module. The address is assigned automatically in accordance with the module’s location in the ring.<br />

Module failure is detected by means of regular short status requests and can be handled by the program as<br />

long as transmission is not interrupted.<br />

Transfer of data to and from an EasyPort module is by means of single addressed read and write commands. A<br />

mode can also be selected which causes the EasyPort to automatically report all changes of its inputs to the<br />

PC.<br />

EasyPort D8A Data sheet as electronics, D-72663 Großbettlingen, Germany


3) SAFETY NOTES<br />

The indicated maximum voltages for the power supply and for the inputs and outputs of the EasyPort must<br />

not be exceeded. Under no circumstances should voltages in excess of 30 V be used. Electrical connections<br />

should only be made and broken with devices switched off. The device may only be used in systems which<br />

return automatically to a safe state when the power is switched off. The safety notes for the connected<br />

devices must also be observed.<br />

4) OPTICAL FIBERS<br />

The link between the PC and EasyPort process interface is by means of an electrically isolated V.24 interface.<br />

Expansion modules are linked via optical fiber. A white "RING OUT" port must always be connected to a<br />

black "RING IN" port. Up to 8 EasyPort modules can be connected in this way. Please carefully insert the end<br />

of the optical fiber all the way into the connection socket and secure the fiber by rotating the collar to the<br />

right.<br />

Individual optical fibers may be in the range of 0.3 to 5.0 meters. Use a sharp blade to cut the plastic optical<br />

fibers to the desired length.<br />

A simple tool for this purpose can be purchased from <strong>Festo</strong>:<br />

LICHTL.SCHNEID. SOE-LKS (part number 36 479)<br />

5) DRIVER SOFTWARE<br />

The Windows driver software EzDDE (PN 374 212) obtainable from <strong>Festo</strong> <strong>Didactic</strong> *) and EzOPC allows you<br />

to read signals in and out of your EasyPort simply using a Windows application. Data exchange takes place<br />

via the DDE or OPC data interface integrated into Windows. This allows any application program provided<br />

with such software interface (such as a STEP7 simulator, a visualization package such as InTouch, or Excel<br />

spreadsheet) to establish contact with the EasyPort. The software of <strong>Festo</strong> <strong>Didactic</strong> is explicitly designed for<br />

this communication e.g. FluidSIM® and Cosimir®.<br />

The EasyPort can be addressed from your own programs (for example in C, PASCAL or BASIC) with the<br />

commands PRINT, INPUT etc. in its CI (Command Interpreter) command language.<br />

*) <strong>Festo</strong> <strong>Didactic</strong> GmbH & Co. KG,<br />

PO Box 100710, D-73707 Esslingen, Germany, Phone +49 711 3467 0<br />

6) DISPLAYS (LEDs on top of module)<br />

SHORT<br />

If a short-circuit is detected at one of the outputs, the red SHORT LED lights. The outputs of the EasyPort are<br />

then switched off.<br />

This LED also lights during power-on of the module. It is switched off again during the course of the poweron<br />

test, before the output drivers are activated.<br />

STATUS<br />

The green STATUS LED has various statuses:<br />

- Flashing 1 Hz: Power-on condition, module not yet communicating<br />

- Pulsating: Module is addressed. The address is shown at intervals of two seconds by the<br />

number of times the LED is switched off.<br />

INPUTS 0 to 7<br />

Status display of the 8 digital inputs by green LEDs.<br />

OUTPUTS 0 to 7<br />

Status display of the 8 digital outputs by green LEDs.<br />

7 SEGMENT DISPLAY<br />

Display of the input/output voltage of the analogue part in Volts<br />

BUTTON SEL<br />

This button selects the analogue channel displayed on the 7 segment display.<br />

An LED line show the currently selected channel.<br />

7) TECHNICAL DATA<br />

EasyPort Process Interface, Basic module D8A<br />

Operating voltage 24 V DC +/- 10%<br />

Power consumption 3 VA<br />

Outputs 8 digital 24V / 2 analogue 0...10V<br />

Output load (max.) 0.3 A per digital output / 10mA per analogue output<br />

Short-circuit protection Yes<br />

Inputs 8 digital 24V / 4 analogue 0...10V<br />

Operating point of the digital input 12 VDC<br />

Hysteresis of the digital input 3 V<br />

Filter 10 ms<br />

Communications interface V.24, electrically isolated and fiber optic<br />

Optical fiber length 0.3 m to 5.0 m<br />

Protocol ASCII, 19.2 kBd<br />

Degree of protection IP20<br />

Immunity to interference Class 4 as per DIN/IEC 801/4<br />

Permissible ambient temperature<br />

operation/storage<br />

0 to 55 °C / 0 to 70 °C<br />

Dimensions in mm / inch (L x W x H) 162 x 148 x 36 / 7.38 x 5.83 x 1.41<br />

Weight in kg 0.65<br />

EasyPort D8A Data sheet as electronics, D-72663 Großbettlingen, Germany

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