8-channel 80 to 250 VAC Isolated Digital Input Module with 16-bit Counters. The I-87058W is an 8-channel AC digital input module with high voltage isolation. The ON voltage level for the module range can be between 80 and 250 VAC, and all DI channels are also able to be used as 16-bit counters. The I-87059W is an 8-channel AC digital input module with high voltage isolation. The ON voltage level for the module range can be between 10 and 80 VAC, ..