Chapter 5 Detailed Descriptions of I/O Modules
GFK-2958E
RSTi-EP User Manual
214
Data Transfer
The process data length can be parameterized to be 8 or 16 Bytes. Byte 0 is used for status and
diagnosis, Byte 1 for the data segment length, and the remaining 6 or 14 Bytes are user data.
Process input data
: The data sent from the serial device are written into the receive memory of the
UR20 module. As soon as the SPS request results in that RX_CNT is not equal RX_CNT_ACK, the data
will be sent in segments via the fieldbus coupler to the PLC. The successfully data transfer will be
acknowledged to the module.
The receive memory can safe a maximum of 255 Bytes. A software handshake (XON/XOFF) or a
hardware handshake (RTS/CTS) can be parameterised using the flow control, so that an alarm will
warn against a buffer overflow.
Process output data
: The data sent from the PLC via the fieldbus coupler are written into the
transmission memory of the UR20 module. The module is continously checking whether data are
ready to be sent or a data transfer to the device has been finished successfully. Not till then the next
data will be transferred.
Process Input Data EP-5261
Byte
Format
Name
Bit
Description
Remarks
IB0
Word
Status and
Diagnosis
IX0.0
Data in the receive
memory
RX = 0: Receive memory is empty
RX = 1: A telegramm or telegramm
segment in the receive memory is
ready for transmission.
IX0.1
Receive memory
nearly full
Only 10 characters are left in the
receive memory. XOFF will be set if
parametrerised.
IX0.2
Not used
IX0.3
RX_CNT
The RX_CNT value is assigned to each
data segment of the process input
data while transmission. The sequence
or the RX_CNT values is:
Binary: 00, 01, 10, 11, 00, ...
Decimal: 0, 1, 2, 3, 0, ...
A faulty data seqence indicates
missing data segments.
IX0.4
RX_CNT
IX0.5
TX_CNT_ACK
The TX_CNT_ACK value is a copy of the
TX_CNT value, which has been
transferred together with the last data
segment of the process output data.
TX_CNT_ACK acknowledges that the
data has been taken over successfully.
IX0.6
TX_CNT_ACK
IX0.7
STAT
STAT = 1: Communication with the
device is without fault.
STAT = 0: Faulty communication with
the device.
IB1
Word
Length of the
data segment
/ of the
subsequent
diagnosis data
RX
Length of the data / diagnosis data in
this frame
IB 2 ... IB 7
or
IB 2 ... IB 15
Received data
User data of the
transferred telegram
segment
Содержание GFK-2958E
Страница 1: ...RSTi EP User Manual GFK 2958E November 2017 ...
Страница 23: ...Chapter 1 Introduction GFK 2958E RSTi EP User Manual 19 Notes ...
Страница 56: ...Chapter 3 Configuration GFK 2958E RSTi EP User Manual 52 Notes ...
Страница 166: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 162 EP 5111 Block Diagram EP 5111 ...
Страница 183: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 179 EP 5111 ...
Страница 184: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 180 EP 5111 ...
Страница 211: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 207 Frequency Counter EP 5212 ...
Страница 316: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 312 Notes ...
Страница 330: ...Chapter 6 Installation GFK 2958E RSTi EP User Manual 326 Notes ...
Страница 344: ...Chapter 7 Earthing and Shielding GFK 2958E RSTi EP User Manual 340 ...
Страница 345: ...Chapter 7 Earthing and Shielding GFK 2958E RSTi EP User Manual 341 Notes ...
Страница 385: ...Chapter 8 Web Server GFK 2958E RSTi EP User Manual 381 Notes ...
Страница 401: ...Chapter 11 Disassembly and Disposal GFK 2958E RSTi EP User Manual 397 Notes ...
Страница 413: ...Chapter 12 LED Indicators and Troubleshooting GFK 2958E RSTi EP User Manual 409 Notes ...
Страница 416: ...Chapter 14Accessories and Replacement Parts GFK 2958E RSTi EP User Manual 412 Notes ...