{"product_id":"schneider-electric-tm2dmm8drt-modicon-m238-discrete-i-o-module","title":"Schneider Electric TM2DMM8DRT Modicon M238 Discrete I\/O Module","description":"\u003cp\u003eConfigured for discrete signal acquisition and relay output switching in Modicon M238 controller architectures, the \u003cstrong\u003eSchneider Electric TM2DMM8DRT\u003c\/strong\u003e (\u003cstrong\u003eTM2DMM8DRT\u003c\/strong\u003e Discrete I\/O Module) provides 4 x 24 VDC inputs and 4 relay outputs through one removable screw terminal block.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eTM2DMM8DRT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSchneider Electric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDiscrete I\/O Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange\u003c\/td\u003e\n\u003ctd\u003eModicon M238 logic controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eTwido, Advantys OTB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiscrete Inputs\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Limits\u003c\/td\u003e\n\u003ctd\u003e20.4 to 28.8 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Logic\u003c\/td\u003e\n\u003ctd\u003eSink or source\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current\u003c\/td\u003e\n\u003ctd\u003e7 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e3.4 kOhm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiscrete Outputs\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eRelay, 1 NO per output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent per Channel\u003c\/td\u003e\n\u003ctd\u003e2 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Output Common Current\u003c\/td\u003e\n\u003ctd\u003e7 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Switching Current\u003c\/td\u003e\n\u003ctd\u003e0.1 mA at 0.1 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Resistance\u003c\/td\u003e\n\u003ctd\u003e45 mOhm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Response Time\u003c\/td\u003e\n\u003ctd\u003e4 ms for state 0 and state 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Response Time\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;= 10 ms from state 0 to state 1; \u0026lt;= 5 ms from state 1 to state 0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Isolation\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput to Internal Logic Isolation\u003c\/td\u003e\n\u003ctd\u003e500 V for 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput to Internal Logic Isolation\u003c\/td\u003e\n\u003ctd\u003e2300 V for 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput to Output Isolation\u003c\/td\u003e\n\u003ctd\u003e1500 V for 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Group Isolation\u003c\/td\u003e\n\u003ctd\u003e1500 V for 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical Durability\u003c\/td\u003e\n\u003ctd\u003e20,000,000 cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Durability\u003c\/td\u003e\n\u003ctd\u003e100,000 cycles under specified AC-15, DC-13 and resistive loads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocal Signalling\u003c\/td\u003e\n\u003ctd\u003e1 display block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Connection\u003c\/td\u003e\n\u003ctd\u003e1 removable screw terminal block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e35 mm symmetrical DIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e20 mA at 24 VDC, state 1, all inputs\/outputs; 25 mA at 5 VDC, state 1, all inputs\/outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.095 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e42.9 W x 90 H x 70 D mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSchneider Electric Modicon I\/O Architecture\u003c\/h3\u003e\n\u003cp\u003eThe TM2DMM8DRT combines four 24 VDC discrete input channels with four normally open relay output channels. The inputs accept either sink or source logic and have a specified 3.4 kOhm input impedance with 7 mA input current.\u003c\/p\u003e\n\u003cp\u003eEach relay output is rated for up to 2 A per channel, with a 7 A maximum current through the output common. The module provides one common point for the input group and one common point for the output group.\u003c\/p\u003e\n\u003cp\u003eThe module uses a removable screw terminal block for field wiring and mounts on a 35 mm symmetrical DIN rail. The specified dimensions are 42.9 mm wide, 90 mm high and 70 mm deep.\u003c\/p\u003e\n\u003cp\u003eThe electrical isolation structure separates the input and output sections from internal logic and provides 1500 V isolation between the input and output channels. No isolation is provided between individual channels within the respective groups.\u003c\/p\u003e\n\u003cp\u003eThe TM2DMM8DRT was discontinued on September 27, 2024. The supplied Schneider Electric data identifies the Modicon TM3 Expansion I\/O module range for M221, M241 and M251 logic controllers as the recommended replacement range. Exact replacement selection should be based on the controller architecture and required I\/O configuration.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the TM2DMM8DRT inputs accept both sinking and sourcing configurations?\u003cbr\u003eA: Yes. The specified discrete input logic supports both sink and source configurations. The input voltage range is 20.4 to 28.8 VDC.\u003c\/p\u003e\n\u003cp\u003eQ: Are the individual input and output channels galvanically isolated from each other?\u003cbr\u003eA: No. The specification states that there is no isolation between channels. Isolation is specified between the input and output groups at 1500 V for 1 minute and between the I\/O sections and internal logic at the stated test voltages.\u003c\/p\u003e\n\u003cp\u003eQ: What mounting and wiring arrangement does the module use?\u003cbr\u003eA: The module mounts on a 35 mm symmetrical DIN rail and uses one removable screw terminal block for electrical connection.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the module on a 35 mm symmetrical DIN rail with adequate mechanical clearance for terminal access.\u003c\/li\u003e\n\u003cli\u003eVerify the 24 VDC input supply remains within the specified 20.4 to 28.8 VDC input range.\u003c\/li\u003e\n\u003cli\u003eConfirm whether each discrete input circuit uses sinking or sourcing logic before field wiring.\u003c\/li\u003e\n\u003cli\u003eKeep input signal wiring physically separated from high-current relay output wiring where practical.\u003c\/li\u003e\n\u003cli\u003eUse the removable screw terminal block according to the terminal assignment documented for the specific module installation.\u003c\/li\u003e\n\u003cli\u003eObserve the 2 A maximum specified current per relay output and the 7 A maximum for the output common.\u003c\/li\u003e\n\u003cli\u003eDo not treat individual channels as galvanically isolated because the supplied specification states that channel-to-channel isolation is absent.\u003c\/li\u003e\n\u003cli\u003eFor shielded field cables, terminate shields according to the plant grounding scheme and avoid creating unintended ground loops.\u003c\/li\u003e\n\u003cli\u003eVerify relay load type and switching current against the specified electrical durability conditions before commissioning.\u003c\/li\u003e\n\u003cli\u003eConfirm controller compatibility before replacing a discontinued TM2DMM8DRT with a TM3 module, since the documented replacement range is designed for Modicon M221, M241 and M251 controllers.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Schneider","offers":[{"title":"Default Title","offer_id":67594128064754,"sku":null,"price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/5589\/5794\/files\/TM2DMM8DRT2.jpg?v=1790676385","url":"https:\/\/www.petrospare.com\/products\/schneider-electric-tm2dmm8drt-modicon-m238-discrete-i-o-module","provider":"Petro Spare Industrial Limited","version":"1.0","type":"link"}