中文版
Description
The 1757-SRM is an Allen-Bradley ProcessLogix and ControlLogix module that is used for
implementing controller redundancy to increase a process system availability. This is done by
employing a secondary controller synchronized with a primary controller installed on Two (2) different ControlLogix chassis.
When implementing a redundant controller system, Two (2) identical ControlLogix chassis must be installed.
The chassis size, the modules installed and positioning, System power supply and module revisions should match
each other. This qualifies the redundant controller setup. One of the chassis will be termed as primary while the other is secondary chassis.
The 1757-SRM features a Fiber Optic port where a 62.5/125-micron multi-mode fiber-optic cable with SC connector
is connected. The other end of the cable connects to the partner 1757-SRM installed on the other ControlLogix chassis. This
cable serves as the synchronization link of the modules and the entire secondary rack.
1757-SRM
The 1757-SRM is a Two (2) slot module. It has module status display that indicates text codes that represent
the module operational status. The PRI LED inform the user which of the chassis within the pair operates as the
primary chassis. The COM LED represents the communication and synchronization status. The Health status
LED indicates if the module is performing self-test, experienced critical failure or operating normally.
The 1757-SRM is compatible with ControlLogix chassis 1756-A4, 1756-A7, 1756-A10, 1756-A13, or 1756-A17 and
System Power Supplies 1756-PA72, 1756-PA75, 1756-PB72, or 1756-PB75. For 1756-A4, recommended installation
slot is 1 or 2; 1756-A7 is slot 4 or 5; 1756-A10 is slot 5 or 6; 1756-A13 is slot 4 or 5 and 1756-A17 is slot 5 or 6.
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