Telemecanique Concept 2.6 XMIT功能块配置手册：2002年英文版详解

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XXMIT: Transmit (Compact, Momentum, Quantum)

840 USE 499 00 October 2002

Detailed Parameter Description

Start A value of 1 at Start initiates the XXMIT operation. The value of 1 must be applied

until the operation has finished or until an error has occurred.

Command The XXMIT interprets each bit of the command word as a function to perform. If bit

7 and 8 are on simultaneously or if any two or more of bits 13, 14, 15 or 16 are on

simultaneously or if bit 7 is not on when bits 13, 14, 15, or 16 are on error 129 will

be generated. For more details refer to XXMIT Communication Functions, p. 23.

The individual bit definitions are shown in the table below.

Command Word Layout

XXMIT Command Word Bit Definitions

Bit Definition

Bit 1 (msb) Reserved

Bit 2 Enable RTS/

CTS modem

control

Set to 1 when a DCE connected to the PLC requires hardware

handshaking using RTS/CTS control. This bit may be used in

conjunction with values contained in StartDly and EndDly. Start of

transmission delay keeps RTS asserted for the time in StartDly (ms)

before XXMIT sends a message out of PLC port. Likewise, end of

transmission delay keeps RTS asserted for the time in EndDly (ms) after

XXMIT has finished sending a message out of the PLC port. Once the

end of transmission delay expires XXMIT de-assert RTS.

Bit 3 Enable

RS485 mode

Set to 1 when the selected port should operate in RS485 mode.

Otherwise it defaults to 0, which is RS232 mode. When using port 2 of a

Momentum PLC in RS485 mode with Modbus Messaging, make sure to

use exactly the same parameters (baudrate, databits, stopbits, parity) for

the XXMIT block as configured for that port.

Bit 4 Reserved

Bit 5 Terminated

ASCII input

Set to 1 to remove and discard all characters from FIFO until the starting

string is matched, then these starting characters and subsequent

characters are written into MsgIn until the terminator sequence is

matched. The terminator string is also written into the MsgIn. Refer to

Terminated ASCII Input Function, p. 24 for more details.

Bit 6 Simple

ASCII input

Set to 1 to remove the ASCII characters from FIFO for writing into MsgIn

array. Refer to Simple ASCII Input Function, p. 26 for more details.

Bit

msb

7 8 9 16

lsb

XXMIT: Transmit (Compact, Momentum, Quantum)

840 USE 499 00 October 2002 17

Bit 7 Enable

ASCII string

messaging

Set to 1 when you want to send ASCII messages out of the PLC. XXMIT

sends ASCII strings up to 1024 characters in length. You program the

ASCII message into the MsgOut. Only use Bit 7 OR Bit 8, do not try to

use both.

Bit 8 Enable

Modbus

messaging

Set to 1 when you want to send Modbus messages out of the PLC.

Modbus messages may be in either RTU or ASCII formats. When data

bits=8, XXMIT uses Modbus RTU format. When data bits=7, XXMIT

uses Modbus ASCII format. Only use Bit 7 OR Bit 8, do not try to use

both.

Bit 9 Enable

ASCII receive

FIFO

Set to 1 to allow the XXMIT block to take control over the selected port

(1 or 2) from the PLC. The block begins to receive ASCII characters into

an empty 512 byte circular FIFO. Refer to ASCII Receive FIFO, p. 34 for

more details.

Bit 10 Enable

back space

Set to 1 to allow special handling of ASCII back space character (BS,

8Hex) when using either Simple ASCII Input (Bit 6) or Terminated ASCII

Input (Bit 5). If Bit 10 is set, each back space character will NOT be

stored into MsgIn. Refer to Enable Back space, p. 34 for more details.

Bit 11 Enable

RTS/CTS flow

control

Set to 1 to allow full duplex hardware flow control using the RTS and CTS

handshaking signals for ASCII massaging. The RTS/CTS operates in

both the input and output modes. Refer to Enable RTS/CTS Flow

Control, p. 35 for more details.

Bit 12 Enable

Xon/Xoff flow

control

Set to 1 to allow full duplex software flow control using the ASCII Xon

character (DC1, 11 Hex) and the ASCII Xoff character (DC3, 13 Hex).

The Xon/Xoff operates in both the input and output modes. Refer to

Enable Xon/Xoff Flow Control, p. 36 for more details.

Bit 13 Pulse dial

modem

Set to 1 when using a Hayes compatible dial-up modem and you wish to

pulse dial a telephone number. You program the phone number into the

MsgOut. The length of the message must be in MsgLen. Pulse dialed

numbers are sent to the modem automatically preceded by ATDP and

with carriage return <CR> and line feed <LF> appended. Since the dial

message is an ASCII string, bit 7 must be ON prior to sending the number

to be dialed.

Bit 14 hangup

modem

Set to 1 when using a Hayes compatible dial-up modem and you want to

hangup the modem. You must use user logic to turn this bit ON. Since

the hangup message is an ASCII string, bit 7 must be ON prior to sending

the message. Hang up messages are sent to the modem automatically

preceded by +++AT and with carriage return <CR> and line feed <LF>

appended. XXMIT looks for a correct disconnect response from the

modem before it turns ON the Done output signal, noting a successful

completion.

Bit Definition

XXMIT: Transmit (Compact, Momentum, Quantum)

840 USE 499 00 October 2002 19

MsgLen You must enter the length of the current message according to the selected XXMIT

function.

The following table gives an overview for Modbus and ASCII functions:

Port Port specifies the communications interface. The only authorized values are the

values 1 and 2. Port 2 is only available on the Momentum PLC.

Baudrate XXMIT supports the following data rates: 50, 75, 110, 134, 150, 300, 600, 1200,

1800, 2000, 2400, 3600, 4800, 7200, 9600, 19200. To configure a data rate, enter

its decimal number. When an invalid data rate is entered, the block displays an

illegal configuration error (error code 127) in the XXMIT Status element.

Databits XXMIT supports the following data bits: 7 and 8. To configure a data bit size, enter

its decimal number into this element. Modbus messages may be sent in ASCII

mode or RTU mode. ASCII mode requires 7 data bits, while RTU mode requires 8

data bits. When sending ASCII character message you may use either 7 or 8 data

bits. When an invalid data bit is entered, the block displays an illegal configuration

error (error code 127) in the XXMIT Status element. For more details on Modbus

message formats refer to Modicon Modbus Protocol Reference Guide (PI MBUS

300).

Stopbits XXMIT supports one or two stop bits. Enter a decimal of either: 1 = one stop bit, or

2 = two stop bits. When an invalid stop bit is entered, the block displays an illegal

configuration error (error code 127) in the XXMIT Status element.

Parity XXMIT supports the following parity: none, odd and even. Enter a decimal of either:

0 = no parity, 1 = odd parity, or 2 = even parity. When an invalid parity is entered,

the block displays an illegal configuration error (error code 127) in the XXMIT Status

element.

XXMIT function Subfunction Message Length

Modbus Messaging 01, 02, 03, 04, 05, 06, 08,

15, 16

Modbus Messaging 20, 21 6

Terminated ASCII Input 5

Simple ASCII Input 1...1024.

ASCII String Messaging 1...1024. The selected length

must match the size of the array

assigned to MsgOut. Otherwise

you get error 129.

XXMIT: Transmit (Compact, Momentum, Quantum)

840 USE 499 00 October 2002

RespTout You enter the time value in milliseconds (ms) to determine how long XXMIT waits

for a valid response message from a slave device (PLC, modem, etc.). In addition,

the time applies to ASCII transmissions and flow control operations. When the

response message is not completely formed within this specified time, XXMIT issues

a fault. The valid range is 0 ... 65535 ms. The timeout is initiated after the last

character in the message is sent.

RetryLmt You enter the quantity of retries to determine how many times XXMIT sends a

message to get a valid response from a slave device (PLC, modem, etc.). When the

response message is not completely formed within this specified time, XXMIT issues

a fault and a fault code. The valid range is 0 ... 65535 # of retries. This field is used

in conjunction with RespTout.

StartDly You enter the time value in milliseconds (ms) when RTS/CTS control is enabled, to

determine how long XXMIT waits after CTS is received before it transmits a

message out of the PLC port. Also, you may use this register even when RTS/CTS

is NOT in control. In this situation, the entered time value determines how long

XXMIT waits before it sends a message out of the PLC port. You may use this as a

pre message delay timer. The valid range is 0 ... 65535 ms.

EndDly You enter the time value in milliseconds (ms) when RTS/CTS control is enabled, to

determine how long XXMIT keeps RTS asserted once the message is sent out of

the PLC port. After the time expires, XXMIT deassert RTS. Also, you may use this

value determines how long XXMIT waits after it sends a message out of the PLC

port. You may use this as a post message delay timer. The valid range is 0 ... 65535

ms.

Retry The value displayed here indicates the current number of retry attempts made by the

XXMIT block. This element is read only.

Active A value of 1 indicates that an XXMIT operation is in progress.

Done A value of 1 indicates that the XXMIT operation has been completed successfully.

1RWH

On RS 485 communication the transmit signal is held to ’1’ during the EndDly

time. On 2-wire connections any characters coming from the communication

partner will be lost.Therefore set EndDly to 0 ms if this function is not needed.

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