mitsu plc problem

I would appreciate any help with my problem with this A2N MISTSU PLC. On the main board contain the PSU, A2NCPU, 3 input modules AX41 at slot 0-2 (32points)slot and 2 Special modules AD61 at slot 3-4. There's an extension board A55B with the leftmost output module AY13 (32 points) at slot 8, followed by another AY13 slot 9, then AY41 (32points) slot 10, then AY40 (16pts) slot 11 and last module AX40 (16pts) slot 12. PLC parameter i/o config. from gx developer as follows:
slot 0: input 32 points
slot 1: input 32 points
slot 2: input 32 points
slot 3: special 32 points
slot 4: special 32 points
slot 5: empty 32 points
slot 6: empty 32 points
slot 7: empty 32 points
slot 8: output 32 points
slot 9: output 32 points
slot 10: output 32 points
slot 11: output 16 points
slot 12: input 16 points

The problem is, when I monitor the outputs starting from y100 and so on from the extension board at my laptop, I could see that they were triggerred but the physical output is still off.
The last input module on the extension board had no problem, I could see them on and off when sensors are triggered. What seems to b the problem?

thanks in advance.

jap