
CPC400 Series User’s Guide Chapter 2: Installation
Doc. 0600-2900-2000 Watlow Anafaze 33
Table 2.3 Digital Output States and Values
Stored in the Controller
1
Read and write these values through serial communications and Log-
icPro programs.
All digital outputs sink current to controller common when
on. The load may powered by the 5VÎ (dc) supplied by the
controller at the TB50, or by an external power supply.
When using an external power supply, bear in mind:
• The CPC400 power supply available from Watlow
Anafaze includes a 5VÎ (dc) supply. When using it to
supply output loads, connect the 5VÎ (dc) common to
the 15VÎ (dc) 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 2.21, then
use a solid-state relay.
The outputs conduct current when they are on. The maxi-
mum current sink capability is 60 mA at 24VÎ (dc). The
outputs cannot “source” current to a load.
Figure 2.21 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
+5VÎ dc
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
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