Product data sheet SR2B121BD Characteristics compact smart relay Zelio Logic - 12 I O - 24 V DC - clock - display Product availability: Stock - Normally stocked in distribution facility Main Range of product Zelio Logic Product or component Compact smart relay type Complementary Local display With Number or control scheme lines 0...500 with FBD programming 0...240 with ladder programming Cycle time 6...90 ms Backup time 10 yearsat 77 F (25 C) Clock drift 6 s/monthat 77 F (25 C) 12 min/yearat 32...131 F (0...55 C) Checks Program memory on each power up Us rated supply voltage 24 V DC Supply voltage limits 19.2...30 V Supply current 100 mA (without extension) Power dissipation in W 3 W without extension Reverse polarity protection With Discrete input number 8 conforming to EN/IEC 61131-2 type 1 Discrete input type Resistive Discrete input voltage 24 V DC Discrete input current 4 mA Counting frequency 1 kHzfor discrete input Voltage state 1 guaranteed >= 15 Vfor I1...IA and IH...IR discrete input circuit >= 15 Vfor IB...IG used as discrete input circuit Voltage state 0 guaranteed <= 5 Vfor I1...IA and IH...IR discrete input circuit <= 5 Vfor IB...IG used as discrete input circuit Current state 1 guaranteed >= 1.2 mA for IB...IG used as discrete input circuit >= 2.2 mA for I1...IA and IH...IR discrete input circuit Current state 0 guaranteed <= 0.5 mA for IB...IG used as discrete input circuit <= 0.75 mA for I1...IA and IH...IR discrete input circuit Input compatibility 3-wire proximity sensors PNP (discrete input) Analogue input number 4 Analogue input type Common mode Analogue input range 0...24 V 0...10 V Maximum permissible voltage 30 V (analogue input circuit) Analogue input resolution 8 bits LSB value 39 mV (analogue input circuit) Conversion time Smart relay cycle time analogue input circuit Aug 17, 2019 1 The information provided in this documentation contains general descriptions and/or technical characteristics of the performance of the products contained herein. This documentation is not intended as a substitute for and is not to be used for determining suitability or reliability of these products for specific user applications. It is the duty of any such user or integrator to perform the appropriate and complete risk analysis, evaluation and testing of the products with respect to the relevant specific application or use thereof. Neither Schneider Electric Industries SAS nor any of its affiliates or subsidiaries shall be responsible or liable for misuse of the information contained herein.Conversion error +/- 5 %at 77 F (25 C)for analogue input circuit +/- 6.2 %at 131 F (55 C)for analogue input circuit Repeat accuracy +/- 2 %at 131 F (55 C)for analogue input circuit Operating distance 10 m between stations, with screened cable (sensor not isolated) analogue input circuit Input impedance 12 kOhm (IB...IG used as analogue input circuit) 12 kOhm (IB...IG used as discrete input circuit) 7.4 kOhm (I1...IA and IH...IR discrete input circuit) Number of outputs 4 relay output(s) Output voltage limits 24...250 V AC (relay output) 5...30 V DC (relay output) Contacts type and composition NO relay output Output thermal current 8 A for all 4 outputs (relay output) Electrical durability 500000 cycles AC-12at 230 V, 1.5 Afor relay output conforming to EN/IEC 60947-5-1 500000 cycles AC-15at 230 V, 0.9 Afor relay output conforming to EN/IEC 60947-5-1 500000 cycles DC-12at 24 V, 1.5 Afor relay output conforming to EN/IEC 60947-5-1 500000 cycles DC-13at 24 V, 0.6 Afor relay output conforming to EN/IEC 60947-5-1 Switching capacity in mA >= 10 mAat 12 V (relay output) Operating rate in Hz 0.1 Hz (at Ie)for relay output 10 Hz (no load)for relay output Mechanical durability 10000000 cycles (relay output) Uimp rated impulse withstand voltage 4 kV conforming to EN/IEC 60947-1 and EN/IEC 60664-1 Clock With Response time 10 ms (from state 0 to state 1) relay output 5 ms (from state 1 to state 0) relay output Connections - terminals Screw terminals, clamping capacity: 1 x 0.2...1 x 2.5 mm AWG 25...AWG 14 se- mi-solid Screw terminals, clamping capacity: 1 x 0.2...1 x 2.5 mm AWG 25...AWG 14 sol- id Screw terminals, clamping capacity: 1 x 0.25...1 x 2.5 mm AWG 24...AWG 14 flexible with cable end Screw terminals, clamping capacity: 2 x 0.2...2 x 1.5 mm AWG 24...AWG 16 sol- id Screw terminals, clamping capacity: 2 x 0.25...2 x 0.75 mm AWG 24...AWG 18 flexible with cable end Tightening torque 4.42 lbf.in (0.5 N.m) Overvoltage category III conforming to EN/IEC 60664-1 Product weight 0.55 lb(US) (0.25 kg) Environment Immunity to microbreaks <= 1 ms Product certifications CSA GL GOST UL C-Tick Standards EN/IEC 61000-4-4 level 3 EN/IEC 61000-4-12 EN/IEC 61000-4-6 level 3 EN/IEC 61000-4-2 level 3 EN/IEC 61000-4-3 EN/IEC 61000-4-11 EN/IEC 60068-2-6 Fc EN/IEC 60068-2-27 Ea EN/IEC 61000-4-5 IP degree of protection IP20 (terminal block) conforming to IEC 60529 IP40 (front panel) conforming to IEC 60529 Environmental characteristic EMC directive conforming to EN/IEC 61000-6-2 EMC directive conforming to EN/IEC 61000-6-3 EMC directive conforming to EN/IEC 61000-6-4 EMC directive conforming to EN/IEC 61131-2 zone B Low voltage directive conforming to EN/IEC 61131-2 Disturbance radiated/conducted Class B conforming to EN 55022-11 group 1 Pollution degree 2 conforming to EN/IEC 61131-2 2