Electro Cam PL-1746 Series - Manual (Page 9)

1-4 Introduction
Basic Terminology
The following terms will be used throughout this manual to explain PL-1746 installation,
programming and operation:
Channels Each Channel (CHN) in the PL-1746 controller contains “on” and “off” pulses for one
revolution of the resolver shaft. Channels are one of two types:
Output Channels—Output Channels are used to control machine functions based on
shaft position. The output turns on when the shaft position is within the bounds of a
pulse that has been programmed into the channel. If a rack is attached to the PL-1746-
C01 module, two analog output channels are also available if analog modules are in-
stalled. Analog outputs are proportional to shaft rpm.
Group Channels—These channels control the interaction between groups of outputs
and an input received from a sensor or other controlling device. See Chapter 6 for
details on Group Channels.
Chassis An enclosure that provides receptacles into which modules are inserted. The chassis
provides connections between the SLC processor, power supply and the modules.
Setpoints “Setpoints” are the points within one rotation of the resolver at which a channel turns on
or off. Setpoints can be programmed into a channel through the keypad/display, or they
can be entered through the backplane. The PL-1746 can turn any given channel on and
off multiple times within one rotation.
Module A device that provides I/O functions in a SLC-500 PLC System.
Pulses A pulse begins at the ON edge and ends at the OFF edge.
Programs Programs are sets of pulses programmed into specified channels. By selecting differ-
ent programs, a machine can be easily reconfigured to run variations in products. The
PL-1746 will store up to 48 programs.
The active program can be selected through the PS-6400 keypad or via the backplane.
Solid State Relay Formerly referred to as a module and now called an SSR, this device, when installed in
a PS-4108 rack, allows the PL-1746-C01 to control high power devices.
Inputs The PL-1746-C01 accepts up to 8 DC input signals from mechanical switches, relay
contacts, two or three-wire sensors, or solid state relays when a PS-4108 rack is at-
tached. These hardware inputs are logically OR'ed with those from the backplane
(O:S.0).
Processor This device is the main control unit of a SLC-500 PLC system.
Groups and Modes Output channels can be combined into “groups”, and each group can be associated
with an input terminal in any of six different “modes” of operation. For example, some
modes activate the group only when the corresponding input has signaled that product
is present. Glue control is a typical application where outputs are disabled until product
is sensed. See Chapter 6 for details.
A feature in certain PLuS controllers that allows the user to divide channels into groups,
each of which can be controlled by assigned inputs. Groups can operate in any one of
six modes.
Rack A PS-4108 rack is a device containing solid state relays and analog output blocks that
connects to the PL-1746-C01 module.
Resolver A resolver is a device that converts shaft position to an electrical signal that can be read
by the PLS module.
Internal High
Speed Logic