In certain Certified Standing Orders, there is a provision that the suspended employee has to report at the gate every day. In case of non-reporting, the employee is treated as absent, and no subsistence allowance is paid (this provision exists in my company).
In such cases, when an employee has to proceed outstation and is unable to mark their attendance at the gate, they apply for leave/permission to leave the station. This request is considered and decided upon. Action is taken if the employee fails to report at the gate, treating it as unauthorized absence in such cases.
A suspended employee is not entitled to leave; there is a decided case (refer to GB Singh's Book on Suspension).