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Iam new in plc field iam using allen bradley plc with analog module 1794 ie12 and oe12..so i want to know if it is required to change any wiring conection or just changes in program to change the analog ampere from 0 to 20mA to -10to 10mA ?

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1794-um062_-en-p.pdf

Check out the above manual under 'Range Selection'.
To scale your data to a different range:
• SLC 500 – use the scaling instruction.
• PLC-5 – determine a constant (slope) by dividing the desired prange by the actual range. Multiply the result by your data, and add or subtract any offset.

Regards,

You are not going to get negative current out. The module output is 0 to 20mA.