SMART I/O User’s Manual
March 12, 1996
©1996 PEP Modular Computers GmbH
Page 2 - 14
Chapter 2 SMART-BASE
Figure 2.5.3.2 shows the TOUT block diagram. Here, the output is only
active when an interrupt on level 4 has been acknowledged by the I/O
controller or a previously set timer has decremented to 0. The driving stage
of the output consists of a Darlington connected transistor pair protected
from inductive loads by a clamp diode. This TOUT line can generate square-
wave pulses from 0.2ms to 178ms and can deliver 500mA continuously at
24V DC. The maximum frequency of TOUT is 5kHz.
Figure 2.5.3.2: Timer I/O (TOUT) Schematic
Load
+Vcc (common)
Gnd
Digital
Output
Timer I/O
TOUT
Output
Stage
1
2
3
2.5.4 Supply Screw Terminals (SCR2)
Pin 1
Pin 3
Pin Nr. Signal
1 SHIELD
2 GND
3 +24V
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