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MELSEC-Q
6 PROGRAMMING
(3) Checking transient transmission errors
Transient transmission errors are checked through the GX Developer network
diagnostics, but they also can be checked with link special relays (SB) and link
special registers (SW). (Refer to Section 8.1.4)
1) When a transient transmission error occurs, Transient error (SB00EE)
is turned ON.
2) An error code is stored in Transient transmission error history
(SW00F0 to SW00FF).
3) The number of transient transmission errors is stored in Transient
transmission error (SW00EE).
4) An exact error code storage area in Transient transmission error
history (SW00F0 to SW00FF) is stored in Transient transmission error
pointer (SW00EF).
5) If Transient transmission error area setting (SB000B) is turned ON, the
error code stored in Transient transmission error history (SW00F0 to
SW00FF) is retained. (Not overwritten even if another error occurs.)
6) Turning ON Clear transient transmission errors (SB000A) will clear the
following areas:
•
Transient transmission error (SW00EE)
• Transient transmission error pointer (SW00EF)
No. Description No. Description
SB000A Clear transient transmission errors
—
SB000B Transient transmission error area setting
SB00EE Transient error SW00EE Transient transmission error
—
SW00EF Transient transmission error pointer
SW00F0 to
SW00FF
Transient transmission error history