To assess the pharmacokinetics of AZD1656, and its metabolite, in type 2 diabetes mellitus patients with varying degrees of renal impairment and to compare the results with those in patients with normal renal function.

Inclusion Criteria:

• Patients with a clinical diagnosis of T2DM for at least 1 year, treated with any OAD or insulin
• Calculated MDRD GFR based on S-creatinine at enrollment should fall within any of the 4 categories: mild , moderate, severe normal

Exclusion Criteria:

• Clinically significant progression of current disease or clinically relevant trauma, as judged by the Investigator, within 2 weeks before the first administration of the IP
• Clinically significant neuropathy according to the Investigator. However subjects with diabetic neuropathy which is not clinically significant according to the Investigator may be included.