Characteristics of the Messaging Service Communication Functions

At a Glance

These functions enable communication between one device and another. Certain functions are common to several types of communication channel. Others may be specific to one communication function.

NOTE: Processing of communication functions is asynchronous in relation to the processing of the application task, which allowed them to be activated. The send/receive telegram and stop operation functions are the only exceptions as their execution is synchronous with the execution of the activation task.

NOTE: It is recommended that asynchronous functions be triggered on edge and not on state to avoid sending several identical requests in quick succession, thus saturating the communication buffers.

Messaging Service Communication Functions on Modicon M340 Platform

The following table gives an overview of Modicon M340 platform messaging service functions:

Function	Role
DATA_EXCH	Transmit or receive data.
ETH_PORT_CTRL	Activate or deactivate a protocol.
INPUT_BYTE	Receive an array of bytes on a character mode link of a BMX NOM module in a local rack or linked to a CPU embedded communication channel.
INPUT_CHAR	Receive a character string on a character mode link of a BMX NOM module in a local rack or linked to a CPU embedded communication channel.
PRINT_CHAR	Send a character string on a character mode link of a BMX NOM module in a local rack or linked to a CPU embedded communication channel.
READ_VAR	Read the value of one or more language objects via a communication module in a local rack or linked to a CPU embedded communication channel.
SEND_EMAIL	Send an email over an Ethernet port of a communication module plugged in a local rack.
WRITE_VAR	Write the value of one or more language objects via a communication module in a local rack or linked to a CPU embedded communication channel.

Messaging Service Communication Functions on Modicon M580 Platform

The following table gives an overview of the Modicon M580 platform messaging service functions:

Function	Role
DATA_EXCH	End any requests (Modbus, Umas …) to any Modbus slave via a communication module plugged in a local rack or in an EIO drop.
GET_TS_EVT_M	Get the time stamped data in a Modicon BMX ERT 1604T or BMX CRA ••••• module plugged in a local rack or in an EIO drop.
INPUT_BYTE	Receive an array of bytes on a character mode link of a BMX NOM module plugged in a local rack or in an EIO drop.
INPUT_CHAR	Receive a character string on a character mode link of a BMX NOM module plugged in a local rack or in an EIO drop.
PRINT_CHAR	Send a character string on a character mode link of a BMX NOM module plugged in a local rack or in an EIO drop.
READ_PARAM_MX	Read the parameter words of an X80 I/O module plugged in a local rack by performing an explicit exchange.
READ_STS_MX	Read the status words of an X80 I/O module plugged in a local rack or in an EIO drop by performing an explicit exchange.
READ_VAR	Read the value of one or more language objects via a communication module plugged in a local rack or in an EIO drop.
RESTORE_PARAM_MX	Restore the parameter words of an X80 I/O module plugged in a local rack by performing an explicit exchange.
SAVE_PARAM_MX	Save the parameter words of an X80 I/O module plugged in a local rack by performing an explicit exchange.
SEND_EMAIL	Send an email over an Ethernet port of a communication module plugged in a local rack (Ethernet modules cannot be plugged in an EIO drop).
WRITE_CMD_MX	Send a command to an X80 I/O module plugged in a local rack or in an EIO drop by performing an explicit exchange.
WRITE_PARAM_MX	Write the parameter words of an X80 I/O module plugged in a local rack by performing an explicit exchange.
WRITE_VAR	Write the value of one or more language objects via a communication module plugged in a local rack or in an EIO drop.

Messaging Service Communication Functions on Modicon Quantum Platform

The following table gives an overview of Modicon Quantum platform messaging service functions:

Function	Role
CREAD_REG	Continuously read a register area from a slave addressed via Modbus Plus, TCP/IP-Ethernet or SY/MAX-Ethernet
CWRITE_REG	Continuously write a register area to a slave addressed via Modbus Plus, TCP/IP-Ethernet or SY/MAX-Ethernet
EXCH_QX	Perform data transfers through an EIO bus to and from Modbus slaves connected to a Modicon M340 rack
INPUT_CHAR_QX	Receive a character string from a Modicon M340 serial communication module through an EIO bus
MBP_MSTR	Perform various network communication operations on Modbus Plus, TCP/IP-Ethernet or SY/MAX-Ethernet
PRINT_CHAR_QX	Send a character string of 1000 bytes maximum from a Modicon M340 Modbus master through an EIO bus
READ_REG	Read a register area from a slave addressed via Modbus Plus, TCP/IP-Ethernet or SY/MAX-Ethernet
READ_REG_QX	Read registers in a Modbus slave connected to a Modicon M340 Modbus master through an EIO bus
READ_STS_QX	Read the status words of a Modicon M340 Ethernet I/O module by performing an explicit exchange with the processor memory
WRITE_CMD_QX	Send a command to a Modicon M340 Ethernet I/O module with a command word by performing an explicit exchange
WRITE_REG	Write a register area to a slave addressed via Modbus Plus, TCP/IP-Ethernet or SY/MAX-Ethernet
WRITE_REG_QX	Write registers in a Modbus slave connected to a Modicon M340 Modbus master through an EIO bus
XXMIT	Modbus messages from master PLC and ASCII input/output strings.

Messaging Service Communication Functions on Modicon Momentum Platform

The following table gives an overview of Modicon Momentum platform messaging service functions:

Function	Role
MBP_MSTR	Perform various network communication operations on Modbus Plus, TCP/IP-Ethernet or SY/MAX-Ethernet.
XMIT	Modbus messages from master PLC and ASCII input/output strings.
XXMIT	Modbus messages from master PLC and ASCII input/output strings.

Messaging Service Communication Functions on Modicon Premium Platform

The following table gives an overview of Modicon Premium platform messaging service functions:

Function	Role
DATA_EXCH	Send/request receipt of data.
INPUT_BYTE	Read an array of bytes.
INPUT_CHAR	Read a character string.
OUT_IN_CHAR	Send a character string and wait for a response.
OUT_IN_MBUS	Emulate a Modbus master communication from a serial link configured in character mode.
PRINT_CHAR	Write a character string.
RCV_TLG	Receive a telegram.
READ_ASYN	Read 1 Kbyte of messaging.
READ_GDATA	Read common Modbus Plus data.
READ_VAR	Read standard language objects: internal words and bits, system words and bits, timers, monostables, drums, registers, counters.
SEND_REQ	Send UNI-TE requests.
SEND_TLG	Send a telegram.
UNITE_SERVER	Process immediately READ_VAR and WRITE_VAR requests on Modbus (Immediate server).
WRITE_ASYN	Write 1 Kbytes of messaging.
WRITE_GDATA	Write common Modbus Plus data.
WRITE_VAR	Write standard language objects: internal words and bits, system words and bits.

Availability of Functions According to Protocols

Protocols supported by the messaging service functions in a Modicon M340 platform:

Function	TCP/IP	ETHWAY	CANopen	Modbus serial	Modbus Plus	Fipway	Uni-Telway	Fipio	Character mode
DATA_EXCH	X	–	X	X	–	–	–	–	X
ETH_PORT_CTRL	X	–	–	–	–	–	–	–	–
INPUT_BYTE	–	–	–	–	–	–	–	–	X
INPUT_CHAR	–	–	–	–	–	–	–	–	X
PRINT_CHAR	–	–	–	–	–	–	–	–	X
READ_VAR	X	–	X	X	–	–	–	–	–
SEND_EMAIL	–	–	–	–	–	–	–	–	X
WRITE_VAR	X	–	X	X	–	–	–	–	–
X Yes – No

Protocols supported by the messaging service functions in a Modicon M580 platform:

Function	TCP/IP	ETHWAY	CANopen	Modbus serial	Modbus Plus	Fipway	Uni-Telway	Fipio	Character mode
DATA_EXCH	X	–	–	X	–	–	–	–	–
GET_TS_EVENT_M	X	–	–	–	–	–	–	–	–
INPUT_BYTE	–	–	–	–	–	–	–	–	X
INPUT_CHAR	–	–	–	–	–	–	–	–	X
PRINT_CHAR	–	–	–	–	–	–	–	–	X
READ_PARAM_MX	X	–	–	–	–	–	–	–	–
READ_STS_MX	X	–	–	–	–	–	–	–	–
READ_VAR	X	–	–	X	–	–	–	–	–
RESTORE_PARAM_MX	X	–	–	–	–	–	–	–	–
SAVE_PARAM_MX	X	–	–	–	–	–	–	–	–
SEND_EMAIL	X	–	–	–	–	–	–	–	–
WRITE_CMD_MX	X	–	–	–	–	–	–	–	–
WRITE_PARAM_MX	X	–	–	–	–	–	–	–	–
WRITE_VAR	X	–	–	X	–	–	–	–	–
X Yes – No

Protocols supported by the messaging service functions in a Modicon Quantum platform:

Function	TCP/IP	ETHWAY	CANopen	Modbus serial	Modbus Plus	Fipway	Uni-Telway	Fipio	Character mode
CREAD_REG	X	–	–	–	X	–	–	–	–
CWRITE_REG	X	–	–	–	X	–	–	–	–
EXCH_QX	X	–	–	X	–	–	–	–	–
INPUT_CHAR_QX	–	–	–	–	–	–	–	–	X
MBP_MSTR	X	–	–	–	X	–	–	–	–
PRINT_CHAR_QX	–	–	–	–	–	–	–	–	X
READ_REG	X	–	–	–	X	–	–	–	–
READ_REG_QX	–	–	–	X	–	–	–	–	–
READ_STS_QX	X	–	–	–	–	–	–	–	–
WRITE_CMD_QX	X	–	–	–	–	–	–	–	–
WRITE_REG	X	–	–	–	X	–	–	–	–
WRITE_REG_QX	–	–	–	X	–	–	–	–	–
XXMIT	–	–	–	X	–	–	–	–	X
X Yes – No

Protocols supported by the messaging service functions in a Modicon Momentum platform:

Function	TCP/IP	ETHWAY	CANopen	Modbus serial	Modbus Plus	Fipway	Uni-Telway	Fipio	Character mode
MBP_MSTR	X	–	–	–	X	–	–	–	–
XMIT	–	–	–	X	–	–	–	–	X
XXMIT	–	–	–	X	–	–	–	–	X
X Yes – No

Protocols supported by the messaging service functions in a Modicon Premium platform:

Function	TCP/IP	ETHWAY	CANopen	Modbus serial	Modbus Plus	Fipway	Uni-Telway	Fipio	Character mode
DATA_EXCH	(1)	X	–	–	–	X	X	–	–
INPUT_BYTE	–	–	–	–	–	–	–	–	X
INPUT_CHAR	X	X	–	–	–	X	–	–	X
OUT_IN_CHAR	X	X	–	–	–	X	–	–	X
OUT_IN_MBUS	–	–	–	X	–	–	–	–	–
PRINT_CHAR	X	X	–	–	–	X	–	–	X
RCV_TLG	–	–	–	–	–	X	–	–	–
READ_ASYN	X	–	–	–	–	–	–	–	–
READ_GDATA	–	–	–	–	X	–	–	–	–
READ_VAR	X	X	–	X	X	X	X	X	–
SEND_REQ	X	X	X	X	X	X	X	X	–
SEND_TLG	–	–	–	–	–	X	–	–	–
UNITE_SERVER	–	–	–	X	–	–	–	–	–
WRITE_ASYN	X	–	–	–	–	–	–	–	–
WRITE_GDATA	–	–	–	–	X	–	–	–	–
WRITE_VAR	X	X	–	X	X	X	X	X	–
X Yes – No (1) Exchanges between applications and UNI-TE requests are available but Modbus requests coding is not available with an ETY Premium module.