Watlow PPC-2000 - Manual (Page 88)

Chapter 2: Hardware Installation PPC-2000 User’s Guide
64 Watlow Anafaze Doc.# 30002-00 Rev 2.3
Connecting Digital Inputs
The PPC-2040 module can accept digital inputs. When the
resistance of an input device is 27 kOhm or greater, the input
is considered off by the PPC-2000. When the resistance is 1
kOhm or less, the input is considered on.
To install a switch as a digital input, connect one lead to the DC
Common input return on the TB50. Connect the other lead to
the desired digital input on the TB50. Refer to Table 2.21 on
page 63 for screw terminal numbering.
Use the Digital I/O parameters to configure digital inputs.
Refer to Digital I/O on page 132.
Figure 2.48 Wiring Digital Inputs
Connecting Counter or Frequency Inputs
A PPC-2040 module accepts single-phase or quadrature pulse
signals from devices such as encoders. Counts and frequencies
of the inputs may be scaled with user selectable parameters.
See Setting up User Selectable Linear Inputs on page 98 for
more information.
The PPC-2040 module can accommodate encoder signals up to
24Vdc. The following figures illustrate connecting encoders:
Figure 2.49 Single Phase Connections: Input 1
and 2 Shown
Digital
Input
Device
TB50
Digital In
Com
1 (input 1 phase 1+)
3 (input 2 phase 1+)
37 (COM)
S1
+
-
+
-
S2
TB50