6ES72121 Series

Part	Operating Temperature (Min)	Operating Temperature (Max)	Approval Agency	Expandable	Voltage - Supply (Maximum)	Voltage - Supply (Minimum)	Number of Outputs	Output Type	Number of Inputs	Input Types	Display Type	Memory Size	Mounting Type	Voltage - Supply	Communications	Features	Ingress Protection
Siemens 6ES72121HF400XB0	0 °C	55 °C	CE cULus FM KC RCM	Non-Expandable	28.8 VDC	20.4 V	6	Relay	8	Digital	No Display	100 kB	Panel Mount
Siemens 6ES72121BE344YB0				Expandable							No Display		DIN Rail	24 VDC	Ethernet	Starter Kit
Siemens 6ES72121HF424YB1				Expandable			4	Relay	16	Digital	No Display		DIN Rail	24 VDC	Ethernet	Starter Kit
Siemens 6ES72121AE400XB0	-20 °C	60 °C		Non-Expandable	28.8 VDC	20.4 V	6	Pulse (4)	8	Digital	No Display	75 KB	Panel Mount				IP20
Siemens 6ES72121HE400XB0	-20 °C	60 °C	CE cULus FM KC RCM UL	Non-Expandable	28.8 VDC	20.4 V	6	Relay	8	Digital	No Display	75 KB	Panel Mount				IP20
Siemens 6ES72121AF400XB0	0 °C	55 °C	CE cULus FM KC RCM UL	Non-Expandable	28.8 VDC	20.4 V	6	Pulse (4)	8	Digital	No Display	100 kB	Panel Mount				IP20
Siemens 6ES72121BE400XB0	-20 °C	60 °C	CE cULus FM KC RCM UL	Non-Expandable	264 VAC	85 VAC	6	Relay	8	Digital	No Display	75 KB	Panel Mount				IP20

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