Watlow Series D8 - Manual (Page 50)

Chapter 2: Installation Series D8 User’s Guide
32 Watlow Anafaze Doc. 0600-3120-2000
Table 2.4 Digital Output States and Values
Stored in the Controller
1 Read and write these values through communications.
All digital outputs sink current to controller common when
on. The load may powered by the 5 Vdc supplied by the con-
troller at the TB50, or by an external power supply. When us-
ing an external power supply, bear in mind:
•
The D8 power supply available from Watlow Anafaze
includes a 5 Vdc supply. When using it to supply output
loads, connect the 5 Vdc common to the 15 Vdc common
at the power supply.
• Do not exceed +24 volts.
• If you connect the external load to earth ground, or if you
cannot connect it as shown in Figure 2.17, then use a sol-
id state relay.
The outputs conduct current when they are on. The maximum
current sink capability is 60 mA at 24 Vdc. The outputs cannot
“source” current to a load.
Figure 2.17 Digital Output Wiring
State Value 1 Description
Off 0 Open circuit
On 1 Sinking current to controller common
Digital Output 1
Digital Output 2
Control Common
+5 Vdc
Loads
Digital Output 1
Digital Output 2
Using External Power Supply
Do not connect
External
Power
+
-
TB50 or TB18
Using Internal Power Supply
Loads
Supply
TB50 or TB18
to earth ground or
equipment ground