Product Manual — Doc. 8559B 4-Series™ Control Systems • 197
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A subordinate 4-Series control system can only be configured to operate as an Ethernet
subordinate to another 3-Series or 4-Series control system. Cresnet suborindate mode is
not supported. A 2-Series control system can operate as a Cresnet or Ethernet
subordinate to a 4-Series control system.
NOTE: There can only be one primary IP table entry.
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A 4-Series control system can switch back and forth between subordinate mode and
normal mode (running registered user programs) without requiring a restart. Parameters
may be set using the ethslvconnfcnt command that determine how long the
subordinate controller tries to connect to the primary before reverting back to its normal
operating mode.
The following behavior is dependent on whether a primary IP table entry exists when booting the
system:
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No primary IP table entry is present when booting the system.
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Adding a primary IP table entry allows the subordinate to start connecting to the
primary. Once the subordinate is connected, all user programs stop executing, and
the device enters into subordinate mode.
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Stopping the program on the primary does not force the subordinate back into its
normal operating mode. The subordinate tries to connect for a set duration before
reverting back to normal operations. After reverting, the subordinate does not go
back into subordinate mode until the control system restarts or the primary IP table
entry is added again.
NOTE: An Ethernet Slave – Reached max count of connect responses
being rejected by master before a successful connect. Not
retrying - Initiating normal behavior error is logged if this condition
occurs.
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Removing the primary IP table entry forces the subordinate control system to revert
back to normal operations.
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A primary IP entry is present when booting the system.
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The subordinate tries to connect to the primary for a set duration.
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If the subordinate connects successfully, it enters subordinate mode.
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If the subordinate does not connect successfully, it enters its normal operating
mode. The subordinate does not go back to subordinate mode until the control
system restarts or the primary IP table entry is added again.
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