Schneider Electric TM221M16R Modicon M221 16 I/O Relay

TM221M16R a 16 I/O Modicon M221 controller with relay outputs

The TM221M16R is a Schneider Electric product listed in the datasheet as: logic controller, Modicon M221, 16 IO, relay. The TM221M16R is the Modicon M221 “M” version, a 16 I/O controller with 8 inputs and 8 normally open relay outputs on a 24 V DC supply. The relay outputs switch AC and DC loads directly, so the controller is used where the machine has mixed-voltage loads and low switching frequency. Seven Star LLC supplies the TM221M16R in Oman and the GCC as an independent supplier based in Muscat.

Decoding the reference: 16 is the I/O total and R is the relay output (the datasheet title names it a 16 I/O relay controller). The datasheet gives 8 inputs, 8 relay outputs and two analogue inputs.

Technical specifications of the TM221M16R

Outputs, supply and endurance of the TM221M16R

Supply voltage: 24 V DC. Supply voltage limits: 20.4 to 28.8 V. Discrete inputs: 8, discrete input IEC 61131-2 Type 1. Discrete outputs: 8 relay. Discrete I/O: 16. Analogue inputs: 2 0 to 10 V. Input resolution: 10 bits. Input voltage: 24 V. Output type: Relay normally open. Output voltage: 5 to 125 V DC; 5 to 250 V AC. Output current: 2A. Communication protocols: USB port USB – SoMachine-Network; Non isolated serial link Modbus master/slave – RTU/ASCII or SoMachine-Network. Output current: 0.52 A 5 V expansion bus; 0.46 A 24 V expansion bus. Output voltage: 125 V DC; 277 V AC. Mechanical durability: 20000000 cycles relay output. Electrical durability: 100000 cycles AC-12, 120 V, 240 VA, resistive; 100000 cycles AC-12, 240 V, 480 VA, resistive; 300000 cycles AC-12, 120 V, 80 VA, resistive.

The relays carry 2 A and switch 5 to 125 V DC or 5 to 250 V AC, with a limit of 7 A per common group. The datasheet lists an electrical life of 100000 cycles for AC-12 resistive load at 120 V and 240 VA, with other values given for other loads.

Power use is 3.6 W without expansion and 22.5 W with expansion, and the supply output is 0.46 A at 24 V and 0.52 A at 5 V. Up to 7 local expansion modules can be attached, so the controller can grow far beyond its base I/O.

Where the TM221M16R makes sense

The strength of this model is its larger 24 V supply to the expansion bus, which allows more modules to be powered without an additional supply. That makes it a practical base when the project may need extra analogue or temperature modules.

Compared with the TM221CE40R, this one has fewer points, DC supply only and no Ethernet in the title. It is therefore for compact machines or retrofits where only a small number of relay outputs is needed.

Selection checklist for the TM221M16R

• Load voltage: 5 to 125 V DC or 5 to 250 V AC on relay contacts.
• Switching frequency: relays suit slow cycles only.
• Supply: 24 V DC, 20.4 to 28.8 V.
• Expansion: up to 7 local modules, and check the bus supply budget.
• Communication: confirm serial or other ports for the HMI.
• Panel space: the housing dimensions in the datasheet.

Wiring and maintenance of the TM221M16R

Keep relay outputs on separate feed groups when the loads have different voltages, and fuse each group. Add suppression across inductive coils to extend relay life.

During maintenance, check for blackened or sticky contacts by listening for chatter and testing outputs in forced mode. A failed output can often be moved to a spare relay output in the program, which restores operation until a replacement arrives.

Typical applications of the TM221M16R in Oman and the GCC

In Oman and the GCC the controller is often used in small pump and booster sets, HVAC dampers, lighting control and workshop machines where 24 V DC is available from a panel power supply.

Dimensions, environment and approvals of the TM221M16R

For the TM221M16R, plan the mounting space from the datasheet: 70 mm (W) x 90 mm (H) x 70 mm (D). The TM221M16R weighs 0.264 kg. Mounting, derating and enclosure choices follow the environmental data below, which should be compared with the actual panel temperature and the dust and humidity of the site in Oman and the GCC.

Ambient temperature limits in the datasheet: -10 to 55 °C horizontal installation. Relative humidity: 10 to 95 %, without condensation in operation; 10 to 95 %, without condensation in storage. Ingress protection: IP20 with protective cover in place. Operating altitude: 0 to 2000 m. Vibration resistance: 3.5 mm 5 to 8.4 Hz symmetrical rail; 3.5 mm 5 to 8.4 Hz panel mounting; 1 gn 8.4 to 150 Hz symmetrical rail; 1 gn 8.4 to 150 Hz panel mounting. Shock resistance: 98 m/s² 11 ms. Standards listed: IEC 61131-2; UL 508; CAN/CSA C22.2 No. 213; IACS E10; ANSI/ISA 12-12-01. Certifications listed for this reference: DNV-GL; ABS; LR cULus; RCM; EAC; CE; UKCA cULus HazLoc.

Information to send with an RFQ for the TM221M16R

• Full reference and quantity required
• Existing equipment, panel or rack it must fit
• Supply voltage, load or signal details of the application
• Required delivery location and timing
• Whether a spare, a replacement or a new installation

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and does not represent itself as an official channel of the manufacturer.