Can 40 be used as the first address for a D7052 Dual Point Module or D7053 I/O Module?
The first address on the I/O module can not be set to a multiple of 8. As a rule of thumb, set the first address as an odd number and you will never hit a multiple of eight.
Addresses that cannot be used to start with on a D7052, D7053, or D7042:
Mux Bus A
Mux Bus B (if Wired Class B)
Part numbers D7024, FPD-7024, D7042, D7052, D7053