Table 6-8. apb setup bytes for pcs modbus slave – Micromod Micro-DCI: 53MC5000 PLC AND PRINTER INTERFACES User Manual
Page 80
6.5.3 PCS MODBUS SLAVE CONTROL BYTES
The APB Setup Bytes, Control and Status Bytes, and applicable Error Code Bytes for Modbus
slave operation are provided in Tables 6-8 through 6-10. If any Control Byte is changed during
operation, it takes up to 10 seconds to become effective (there is a 10 second interval be-
tween PCS checks for setup changes.)
Table 6-8. APB Setup Bytes for PCS Modbus Slave
Title
Definition
Set
By
DDI-A
DDI-B
De-
fault
Mode
It designates the APB communications functionality as
follows:
0 = Off, 3 = Modbus RTU Mode
This datapoint should be left at 0 and configured to
a 3 after all of the other control bytes are
configured because setting this datapoint causes
the Modbus PLC Interface functionality to start.
User
B290
B456
0
Baud
Rate
It designates the data transfer rate as follows:
10 = 38400, 9 = 28800, 8 = 14400, 7 = 19200,
6 = 9600, 5 = 4800, 4 = 2400, 3 = 1200,
2 = 600, 1 = 300, 0 = 110
User
B292
B458
0
Set-Up
It designates the data format transfer protocol as
follows:
0 = 8 bits, 1 stop bit, no parity
1 = 8 bits, 1 stop bit, even parity
2 = 8 bits, 1 stop bit, odd parity
3 = 7 bits, 1 stop bit, even parity
4 = 7 bits, 1 stop bit, odd parity
5 = 7 bits, 2 stop bits, no parity
User
B293
B459
0
Table 6-9. Control and Status Bytes for PCS Modbus Slave
Title
Definition
DDI-A DDI-B
Set
By
De-
fault
Self
Address
It is the PCS slave address used to respond to all
messages.
B670
B646
User
0
Setup
Error
10 = Scan Time at 0.
B684
B660
Soft-
ware
0
Scan
Time
It is the PCS time period for the read and write phases
of a PCS-PLC transaction. It is entered as a number
from 1 to 255 which represents 100 to 25,500 ms. (See
Section 3.7.)
B685
B661
User
0
Scan
Overruns
Counter*
This counter is incremented each time the read-write
phases exceed the specified Scan Time. It indicates the
Scan Time should be increased. (See Section 3.7.)
B686
B662
Soft-
ware
0
*User can reset by writing zeros into the datapoints.
53MC9015 53MC5000 PLC and Printer Interfaces
6-16
MODBUS2