(1)Communication monitor flag
This flag is used to monitor the communication condition with other stations.
Flag | Condition for flag operation | Flag operation | |
Own | When the parameter address 007777(8) of the master station is set to "01(H)," | ON | |
station | and the master station is operating normally. | ||
flag |
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When the parameter address 007777(8) of the master station is set to "00(H)." |
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(master | OFF | ||
Improper setting of parameter, BCC check error, or other errors. | |||
station) |
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Flag | Condition for flag operation | Flag operation | ||
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Other | Normal communication with slave stations. | ON | Specific | |
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Stopped communication or unable to |
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station’s |
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flag | communicate with slave stations. | OFF | station | |
Communication monitor flag (1) of the master |
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(01 to 77) | All slave stations | |||
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| station is turned "OFF." |
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The master station periodically executes communication recovery operation with the communication error slave station. When the error situation is recovered, the master station returns to normal communication.
(2)Operation condition monitor flag [1]
This flag is used to monitor the operation condition of slave stations when the communication with each slave station is normal.
Flag | Condition for flag operation | Flag operation |
Own | Communication monitor flag (1) of the master station is turned "ON." | * ON |
station flag | ||
(master |
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Communication monitor flag (1) of the master station is turned "OFF." | OFF | |
station) |
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Flag | Condition for flag operation | Flag operation |
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| Slave station is operating. | ON | Specific |
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| slave |
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Other | Slave station stops operation (not by an error cause). |
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station’s |
| OFF | station |
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Communication monitor flag (1) of the master |
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All slave stations |
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flag | station is turned "OFF." |
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(01 to 77) |
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Slave station that communication monitor flag (1) | Not specified |
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*Even if a master station PC has stopped operation normally or by an error, the
(3)Operation condition monitor flag [2]
This flag is used to monitor the abnormal stop of each slave station when the communication with each slave station is normal.
Flag | Condition for flag operation | Flag operation | |
Own | Communication monitor flag (1) of the master station is turned "ON." | * ON | |
station flag | |||
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(masterstation) | Communication monitor flag (1) of the master station is turned "OFF." | OFF |
Flag | Condition for flag operation | Flag operation | |||
| Each slave station is normal. | ON | Specific | ||
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Other | Any of the slave stations is faulty (caused to be |
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station’s | stopped abnormally). | OFF | station | ||
flag | Communication monitor flag (1) of the master station | All slave |
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(01 to 77) | is turned "OFF." |
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Slave station that communication monitor flag (1) is | Not specified | ||||
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| turned to "OFF." | ||||
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*Even if a master station PC has stopped operation normally or by an error, the