Emerson PNC001-A Series User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 5
GFK-2222AK October 2019
Communications 125
5.2.1 Serial Port Communications Capabilities
COM1 and COM2 can each be configured for one of the following modes. For details on
CPU configuration, refer to Section 3:.
▪ RTU Slave – The port can be used for the Modbus RTU slave protocol. This mode also
permits connection to the port by an SNP master, such as the WinLoader utility or
the programming software. For details, refer to Section 6:, Serial I/O, SNP & RTU
Protocols.
▪ Message Mode – The port is available for access by user logic. This enables C
language blocks to perform serial port I/O operations via C Runtime Library
functions.
▪ Available – The port is not to be used by the CPU firmware.
▪ SNP Slave – The port can only be used for the SNP slave protocol. For details, refer to
Section 6:, Serial I/O, SNP & RTU Protocols.
▪ Serial I/O – The port can be used for general-purpose serial communication through
use of COMMREQ functions. For details, refer to Section 6:, Serial I/O, SNP & RTU
Protocols.
5.2.1.1 Features Supported
Feature
Serial Port 1
(COM1)
Serial Port 2
(COM2)
RTU Slave protocol
Yes
Yes
SNP Slave
Yes
Yes
Serial I/O – used with COMMREQs
Yes
66
Yes
Firmware Upgrade
(WinLoader utility)
PLC in
STOP/No IO mode
No
Message Mode –used only with C blocks
(C Runtime Library Functions:
serial read, serial write, sscanf, sprintf)
Yes
Yes
RS-232
Yes
No
RS-485
No
Yes
66
Serial IO is the only protocol supported by CPE400.

Emerson PNC001-A Series Specifications

General

Brand	Emerson
Model	PNC001-A Series
Category	Controller
Language	English