10 TROUBLESHOOTING
(2)Example of a program that reads from the current setting status storage area
The following shows an example of a program that reads from the switch setting status storage area for current operation of the Q series C24.
For details regarding XE and XF of the input/output signals used in the program, see Section 10.1.2 (3).
(input/output signals X/Y00 to X/Y1F of the Q series C24)
Example of FROM instruction
Reads error description from address 203H.
Reads CH1 side communication protocol status and transmission status from addresses 252H to 253H.
Reads CH2 side communication protocol status and transmission status from addresses 262H to 263H.
Reads station No. from address 24FH.
After checking error codes and changed setting values, designate the correct setting values and switch mode.
| b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 | b3 | b2 | b1 b0 |
| Communication protocol | |||||||||||||
D0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | Error description (2: Communication rate error) | ||
D1 | |||||||||||||||||||
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | CH1 side | Setting communication protocol number 6 | ||
D2 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | (transmission setting description) | ||
D3 |
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0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | CH2 side | Setting communication protocol number 1 | ||
D4 |
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0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 |
| (transmission setting description) | ||
D5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | Station No. 1 being set. | ||
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While the CH1 side is set to the non procedure protocol and the CH2 side is set to the MC protocol (format 1), this indicates the communication rate setting error on the CH1 side.
10 - 14 | 10 - 14 |