Red Lion C48T - Manual (Page 14)

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User Inputs
The three external user inputs are programmable inputs that can be
configured as current sinking (active low) or current sourcing (active high)
inputs via a single plug jumper. Programmable external user inputs are digital
inputs. The use of shielded cable is recommended. Follow the EMC Installation
Guidelines for shield connection. See User Inputs, page 19, for a description of
all available user input functions. The active logic state of ALL user inputs is
dictated by the position of the User Input plug jumper. The plug jumper is
located on the CPU board (See Figure 9, User Input and Program Disable
Jumper Locations).
OUTPUT WIRING
Relay Connections
To prolong contact life and suppress electrical noise interference due to the
switching of inductive loads, it is good installation practice to install a snubber
across the contactor. Follow the manufacturer’s instructions for installation.
Note: Snubber leakage current can cause some electro-mechanical devices to be
held ON.
Program Disable Plug Jumper
The program disable plug jumper is used to enable and disable front panel
programming of the C48T. See Front Panel Accessible Functions With Program
Disable, page 11, for a description of available functions. The plug jumper is
located on the CPU board (See Figure 9, User Input and Program Disable
Jumper Locations).
Figure 9, User Input and Program Disable Jumper Locations
Figure 7, User Input Jumper Settings
Figure 8, Program Disable Jumper Settings
User Input State
Input Voltage Level for Jumper Position
Source Sink *
Active Vin > 3.5 VDC Vin < 1.5VDC
Inactive Vin < 1.5 VDC Vin > 3.5VDC
* Factory Setting
C48t-im.QXD 3/5/04 3:28 PM Page 8