Technical information

Read This First. OPTO DIO Reference
CHAPTER 1
OPTO OUTPUTS,
INPUTS, WATCHDOG,
AND POWER.
Introduction.____________
This chapter describes the features common to many of the
opto i/o cards. The topics covered are the external user supplied
power supply, the output drivers types, the input circuit and the
watch dog timer.
Power Supply._____________
Those cards that have opto isolated outputs require an
external power input to drive the isolators and the output driver
chips. The external power input is a nominal 24 volts input put.
Figure 1-1. Regulated Power Supply.________________________________
Either a commercially available DC power supply or a
home made one may be used. The supply can be regulated or un
regulated. The opto cards have on board regulation and reverse
connection protection. Suitable regulated and unregulated supply
circuits are given below. The power supplies range 17.5 to 30
Volts maximum capable of supplying a minimum of 2 Amps at
25 Volts. ie 50 VA rating. (OUT48 4 Amp @ 25 Volt= 100VA)
Chapter 1 Page 1