Emerson PACSystems RSTi-EP User Manual page 235

User Manual
GFK-2958J
Process Input Data EP-5261
Byte Format Name
Status and
IB0 Word
Diagnosis
Length of the
data segment /
IB1 Word or of the
subsequent
diagnosis data
IB 2 ... IB 7 or
Received data
IB 2 ... IB 15
Detailed Description of I/O Modules
Bit Description
Data in the
IX0.0
receive memory
Receive memory
IX0.1
nearly full
IX0.2 Not used
IX0.3 RX_CNT
IX0.4 RX_CNT
IX0.5 TX_CNT_ACK
IX0.6 TX_CNT_ACK
IX0.7 STAT
RX
User data of the
transferred
telegram
segment
Remarks
RX = 0: Receive memory is empty
RX = 1: A telegram (or telegram segment)
in the receive memory is ready for
transmission.
Only 10 characters are left in the receive
memory. XOFF will be set if parameterized.
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 sequence indicates missing
data segments.
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.
STAT = 1: Communication with the device
is without fault.
STAT = 0: Faulty communication with the
device.
Length of the data / diagnosis data in this
frame
Chapter 5
Oct 2019
220