4
◆
If input pull-ups are required, refer to “Configuration” later in this section.
◆
Wiring terminals are suitable for up to two 12–22 AWG wires. If more than
two wires are required, use an external terminal strip for additional connec-
tions.
Note:
Pulse inputs may be used under the following conditions:
◆
If the pulse input does not use a voltage variation, then leave the input pull-up
in the “On” position.
◆
If the pulse produces voltage peaks (up to +5 VDC max.), then the input pull-
up must be set to the “Off” position.
◆
The maximum pulse rate is 8 HZ (8 pulse/sec).
Connecting Outputs
Twelve Universal Outputs are available for output connections labeled as 1–12 on
the output terminal blocks. The outputs are grouped into three groups of four
outputs each with a shared grounds (labeled “SC”) in each block.. Each output
can produce 50 mA at +12 VDC. If a greater current is required, KMC recom-
mends the use of Override Boards discussed later in this section.
A separate ground block provides six additional ground connections.
Network Connections
The controller provides connections for two types of RS–485 circuits.
RJ-12
The RJ–12 connector provides a six-wire RS-485 connection to a modem or PC
using the KMD-5559 CommTalk Data Exchange Module. Simply connect a
suitable RJ-12 cable between the devices.
RS-485 Inputs
A RS–485 terminal is available for connections to a network of controllers If the
Controller is at the End-of-Line, refer to “Configuration” after connections are
completed.
Detail
The End-of-Line connection will have only one wire attached to the A and B
terminals.
◆
For reliable operation, use Belden cable model #82760 or equivalent (18 gauge,
twisted, shielded, 50 picofarads or less) for all network terminal block connec-
tions.
◆
Connect the nodes of the network in a daisy-chain arrangement. This means:
Connect the
A
terminal in parallel with all other
A
terminals.
Connect the
B
terminal in parallel with all other
B
terminals.
◆
Connect the shields of the cable together at each controller.
Installation
KMD-5831 PLC-28 Direct Digital Controller Installation & Operation Guide
