Emerson PACSystems RSTi-EP - 5.22 Digital Pulse Width Modulation Output Module EP-5442

User Manual Section 5
GFK-2958L May 2021
Detailed Description of I/O Modules 263
Name
Bytes
Bit
Description
Default
3
0
4
Reserved
0
5
Reserved
0
6
Reserved
0
7
Reserved
0
Error byte 2
2
0-7
Reserved
0
Error byte 3
3
0-2
Reserved
0
3
Internal diagnostic FIFO full
0
4-7
Reserved
0
Channel type
4
0
Channel type 0x79
1
1
0
2
0
3
1
4
1
5
1
6
1
7
0
Diagnostic bits per channel
5
Number of diagnostic bit per channel
0
Number of channels
6
Number of similar channels per module
1
Channel error
7-10
0-31
Reserved
0
Time stamp
43-46
Time stamp [
μ
s] (32-bit)
5.19.5 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 RSTi-EP 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 network adapter 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 parameterized 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 network adapter are written into
the transmission memory of the RSTi-EP module. The module is continuously 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.