Watlow Series D8 - Manual (Page 205)

Series D8 User’s Guide Chapter 8: Specifications
Doc. 0600-3120-2000 Watlow Anafaze 187
Table 8.13 Digital Inputs
Outputs
The controller directly accommodates switched dc and open-
collector outputs only. These outputs can be used to control a
wide variety of loads. They are typically used to control solid
state relays or other power switching devices which, in turn,
control devices such as heaters. They may also be used to sig-
nal another device of an alarm condition in the controller.
Analog outputs may be accomplished by using Dual DAC or
Serial DAC modules in conjunction with one of the control
outputs.
An open-collector CPU watchdog output is also provided so
that an external device can monitor the CPU state.
Analog Outputs
No direct analog outputs are provided.
The digital outputs may be used in conjunction with Dual
DAC or Serial DAC modules to provide analog signals. See
Dual DAC Specifications on page 191 and Serial DAC Spec-
ifications on page 193.
Number
With TB50: 8
With TB18: 3
Function
Selectable for output override or remote job
selection
Input Voltage Protection
Diodes to supply and common. Source must
limit current to 10 mA for override conditions
Voltage Levels
<1.3 V = Low
>3.7 V = High (TTL)
5 V maximum, 0 V minimum
Maximum Switch Resistance to Pull Input Low 1.7 k Ω
Minimum Switch Off Resistance 1.4 k Ω
Response Time
50 ms (AC line frequency set to 60 Hz)
60 ms (AC line frequency set to 50 Hz)