Watlow 8PID Controller Manual do Utilizador descarregar pdf (Página 27)

1. As a TTL signal by connecting to "AL" pin and "GND".

ON < 0.5V at 4ma sink

OFF = 5V at 400ohm source resistance

2. To drive A 3-32V type solid state relay.

TRUE LOGIC

Connect "AL" pin to - side of control input.

Connect +5V (pin "SP7" for S.N.P2000 and above) to + side of control

input.

When output is on, relay turns on.

When output is off, relay turns off.

3. To drive a 3-32V type solid sate relay.

INVERTED LOGIC

Connect "AL" pin to + side of relay.

Connect "GND" pin to - side of relay.

When output is on, relay turns off.

When output is off, relay turns on.

5.7 ALARM EXPANDER AND DIGITAL I/O

The optional alarm expander provides EEROM [memory] storage of control parameters

and is highly recommended in critical situations. The Alarm expander also provides for

22 digital input and output lines. Please see the separate manual for this device.

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Watlow 8PID Controller Manual do Utilizador Página 27