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4.6.1 The DN211 Operation Modes
The DN211 has the following operation modes:
1) Initialize Mode
• The DN211 is in the process of resetting when the power is turned ON or reset is requested.
• The reset processing turns "standby mode" when the reset processing is completed
successfully.
• The reset processing turns "down mode" when the reset processing fails to complete
successfully (e.g, when an error occurs in self-testing).
• Don't issue an instruction from the user program of the T2/T2E/T2N side during "initialize
mode."
2) Standby Mode
• The DN211 turns this mode when the reset processing is completed successfully after you turn
ON the power or request resetting.
• An operation mode control request can changes run mode to standby mode.
• Only this mode allows you to set the parameters of the local node/slave devices to the DN211.
• Unless the parameters of the local node is set, "run mode" cannot be set from this mode.
3) Run Mode
• After the parameters of the local node are set, an operation mode control request allows you to
change to run mode.
• This mode allows the DN211 to transmit to salve devices.
• This mode allows you to select a transmission mode (polling mode/bit strobe mode) with slave
devices.
• This mode allows you to select a transfer mode (synchronous/asynchronous mode) between
the T2/T2E/T2N ⇔ DN211.
4) Down mode
• Indicates that the DN211 has turned unrecoverable abnormal state.
• A reset request can change to "standby mode." If such a reset request gets an error response,
turn OFF and ON the power for recovery.
• See "Table 4.4 Down Information" for the possible cause of the down mode.
Figure 4.11 illustrates transitions of the DN211 operation modes. Inside square frames indicates the
operation mode of the DN211. The operation mode in thick squared frame is the one that the user
program can control. The thick arrowheads indicate the request that the user program can specify.
Run
(transmission enabled)
Standby
Down
Initialize
Power downed
switch ON the power
Reset request
or
switch ON the power
Self-check
completed
unsuccessfully
Reset request
Unrecoverable error occurred
Run request
Reset request
Self-check completed successfully
a) Standby request
b) T2/T2E/T2N: RUN
→
HALT
c) Busoff occurred
For the case BUSOFF on DIP-
SW on front panel remains ON.
Figure 4.11 The DN211 Operation Modes
CAUTION
1. If the T2/T2E/T2N turns into HALT/ERROR mode, the DN211 in run mode becomes standby
mode.