Mitsubishi FX3U-232-BD User Manual page 526

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
12.4.17 Receiving sum (calculation result) [D8415 and D8435]
These devices store the sum check value calculated using the received data.
1. Detailed contents
When "sum check provided" is selected in the communication format settings, the sum check is executed for
the sent and received data.
These devices store the sum calculated by the FX PLC from the data received sent from the external
equipment.
When communication port ch1 is used, D8415 stores the receiving sum.
When communication port ch2 is used, D8435 stores the receiving sum.
2. Cautions on use
When selecting "sum check provided", make sure to also select "terminator provided".
12.4.18 Sending sum [D8416 and D8436]
These devices store the sum check value added to the send data.
1. Detailed contents
When "sum check provided" is selected in the communication format settings, the sum check is executed for
the sent and received data.
These devices store the sum calculated from the send data.
When communication port ch1 is used, D8416 stores the sending sum.
When communication port ch2 is used, D8436 stores the sending sum.
2. Cautions on use
When selecting "sum check provided", make sure to select "terminator provided".
12.4.19 Operation mode display [D8419 and D8439]
These devices store the communication type being used.
1. Detailed contents
These devices store the code of the communication type currently being used in the communication port.
When communication port ch1 is used, D8419 stores the communication type.
When communication port ch2 is used, D8439 stores the communication type.
The table below shows the contents of the communication type codes.
Code
0
2
3
4
5
6
7
2. Cautions on use
These devices store "5" while RS2 instruction is being driven or when RS2 instruction is not changed over to
another mode.
F-88
Programming communication
Protocol dedicated to computer link
N:N Network
RS instruction
RS2 instruction
Parallel link
Inverter instruction
12.4 Details of Related Devices (RS2 Instruction)
Description
12 Related Data