130 Programmable Logic Controllers: Hardware and Programming
Channel one:
Channel used to connect
the PLC to the PC or to
other PLCs. It has an
RJ-45 connection port.
Channel zero:
Channel used to connect
the PLC to peripheral
devices such as a
barcode reader. It has
an RS 232C connection
port.
how many ports each module in the expansion slot has. Finally, it prints
the number of input/output devices used. The fixed SLC 500 PLC has
one slot or module. It is addressed as slot or module zero. Slot zero is
used with the 1747-L20A processor and has twelve input and eight out-
put ports. These ports are rated for 120 VAC input/output operations.
The modular SLC 503 trainer has four slots or modules. Slot zero
must always be configured for the processor type 1747-L532. Slot one
is configured for a module that has sixteen input ports (1746-IB16). Slot
two is configured for a module that has sixteen output ports (1746-
OBP16). All the input and output ports are rated for 120 VAC operation.
The
Channel Configuration
report lists the controller channel num-
ber used for the communication between the PLC and the computer.
The PLC is assigned to station or node zero. You should configure
the AB_PIC-1 (Allen-Bradley Peripheral Interface Connector) device
driver that uses channel one. Channel one has the RJ-45 connection
terminal. The RJ-45 type terminal looks similar to the RJ-11 tele-
phone jack terminal, except the RJ-45 is larger than the RJ-11 terminal.
Channel one is always used for connecting the 1747-PIC communi-
cation interface device to the PLC and the computer. Channel zero
could also be used for connecting peripheral devices such as a bar-
code reader or a printer directly to the SLC 502, SLC 503, SLC 504, and
SLC 505 PLC systems. Channel zero uses the RS 232C (Recommended
Standard 232C) standard channel available on these PLC systems.
Since channel zero is usually used for connecting a barcode scanner
or a printer to the PLC, most commonly used PLC trainers do not use
channel zero. These trainers use channel one. Therefore, you do not
need to select this option.
The
Custom Data Monitor
report provides you with a list of the
addresses in the custom data monitor, their symbols, and the current
value of the bit or word address. For the smaller SLC 500 and SLC 501 pro-
grammable logic controller systems, you don’t need to print this report.
The
Cross Reference
report specifies which data files and rungs the
addresses in your project are using. For smaller ladder logic diagrams
with only a few rungs, you don’t need to print this report option.
A
Multipoint List
report contains a list of addresses used in the lad-
der logic diagram. These addresses can be for input/output devices
(I/O), contact bits (B3 or B10), timer (T4), counter (C5), control register
(R6), or status register (S2). This is only available with Allen-Bradley
MicroLogix 1000, SLC 5/03-OS302, and SLC 5/04-OS401 controllers.
The multipoint reports the addresses used and their conditions or states
while the PLC was operating. Occasionally, you should select this option
to review conditions while troubleshooting your PLC project.
Data Base
The
Data Base
section of the report option in the dialog box
has three options. These options are Address/Symbols,
Instruction
Comments, and
Symbol
Groups.