Auxiliary Supply & External Input Rating:

1: Auxiliary supply - 20 to 60 Vdc, external input - 24 Vdc
2: Auxiliary supply - 20 to 60 Vdc, external input - 48 Vdc
3: Auxiliary supply - 80 to 300 Vdc / 80 to 250 Vac, external input - 110 Vdc
4: Auxiliary supply - 80 to 300 Vdc / 80 to 250 Vac, external input - 220 Vdc

Number of Inputs & Outputs:

A: 8 External inputs, 8 relay outputs
B: 16 External inputs, 16 relay outputs
C: 16 External inputs, 24 relay outputs
D: 24 External inputs, 32 relay outputs

Communication Ports:

1: Redundant Ethernet port (100BASE-T, RJ45, PRP)
2: Redundant Ethernet port (100BASE-FX, ST, PRP)
3: One Ethernet port (100BASE-T, RJ45)
4: One Ethernet port (100BASE-FX, ST)

Frequency:

A: 50 Hertz
B: 60 Hertz

Conformal Coating:

0: Not coated