The above figure is incorrect. The Maximum rent limit for a couple with 1 child is €1000 per month, which means that if the rent exceeds that amount, no supplement is payable (but see last paragraph). This is not the maximum amount payable as Rent Supplement. There is a minimum contribution which the tenant must make of €18 per week, and depending on income, there could be additional contributions required by the tenant.
However, if the tenants have recently become unemployed, the maximum rent limit may not be applied - there is an exception made for persons who could afford their rent at the start of a tenancy and have to apply due to changed circumstances.