The 2552-A is a high-speed 8-channel isolated RTD input module designed to be compatible with the 2500 Series® PLC I/O base. The 2552-A translates RTD input signals into scaled temperature values and millivolt input signals into equivalent digital words.

The 2557 is a high-speed 16-channel isolated RTD input module designed to be compatible with the 2500 Series® I/O base. The 2557 translates millivolt level signals from the RTD element into a scaled temperature value. IMPORTANT NOTE: 2557 HAS BEEN MATURED.  IT IS REPLACED BY 2557-A, WHICH SHOULD BE USED ON ALL NEW DESIGNS.

The 2557-A is a high-speed 16-channel isolated RTD input module designed to be compatible with the 2500 Series® I/O base. The 2557-A translates millivolt level signals from the RTD element into a scaled temperature value.

The 2559-RTD is a high speed 8-channel RTD input module designed to translate RTD input signals into scaled temperature values in a 2500 Series® I/O base.