LPM-OPTO48 MCM-OPTO48 48-Channel, Opto-isolated STD BUS, CMOS STD BUS Debounced Input with Interrupts FEATURES � 48 Digital Input channels each with: - Optically isolated differential inputs accept voltage differential up to 30 volts - 1500 Vrms input to output isolation - Debounced inputs � Generates an interrupt on signal change-of-state - Supports 48 event sense lines - Software selectable edge polarity for each line - Software enabled interrupt for each line - Change-of-state latched for each line � Dual 50-pin header connectors � STD Bus and CMOS STD Bus interface � +5 volt only operation � Extended operational temperature range: -40° to +85°C for the LPM-OPTO48 The LPM/MCM-OPTO48 is a highly versatile 48 channel, optically isolated and debounced STD Bus digital input card for industrial applications. Each input line is iso- lated from the others and from the bus interface circuits to provide a barrier between the control system and Opto Isolation - Each input line is optically isolated harsh industrial environments. from others and from the bus interface circuits. The isolation voltage rating between the input and output One important feature of this card is its ability to of the photocoupler device exceeds 1500V. debounce then monitor both rising and falling edge transitions of a signal, latch it and then interrupt the The voltage differential required to guarantee an ON processor to signal that a change of status has occurred state is between 10 to 30 volts. Contact WinSystems if on any input line. your input requirements differ. The standard input configuration is differential; however, an option is sup- FUNCTIONAL CAPABILITY ported to provide a common anode or common cath- ode configuration with all the photocouplers. Bus Interface - The MCM-OPTO48 is the STD Bus and the LPM-OPTO48 is the CMOS STD Bus version of the Contact Bounce Elimination - After the opto-isolation board. Programming, cable pin-outs, bus pin assign- circuit, each of the 48 input lines inputs a MC14490 ments, and jumper configurations are identical for both contact bounce eliminator. Its purpose is the elimina- cards. The LPM/MCM prefix indicates the card has the tion of extraneous level changes that result when inter- same features and functionality but a different bus inter- facing with mechanical contacts from devices such as face logic, power requirements and operational tem- switches or relays. This circuit will remove bounce on perature range. both the “make” and “break” of a contact closure before it inputs the WS16C149. Addressing - The LPM/MCM-OPTO48 card is I/O mapped for either 8-bit or 10-bit addressing on any even There is a small amount of time delay in this circuit 16-port boundary. IOEXP is jumper selectable as active which is a function of the edges of the input signal and high, active low, or don’t care. the clock frequency of the MC14490 device. The typi- cal debounce time is 20 milliseconds. Contact us if you Digital Input Circuit - Each digital input line on the need a different time period. LPM/MCM-OPTO48 is wired in series to a photocou- pler, a contact bounce eliminator and then to Event Sense Operation - WinSystems’ WS16C149 ASIC WinSystems’ WS16C149 OPTO I/O controller ASIC. supports all 48 lines and can generate an interrupt when an event occurs either on a positive or neg- Mechanical ative transition of the input. Transition polarity is Dimensions: 4.5” x 6.5” programmable and enabled on a bit-by-bit basis. Each lines’ transition is latched by the event so Connectors that even short duration pulses will be recog- Digital Input: Two, 50-pin dual 0.100” headers nized. An interrupt ID register is maintained for STD Bus: 56-pin dual 0.125 inch centers each line for writing more efficient Interrupt Jumpers: 0.025” square posts Service Routines. The board can generate system interrupts which are routed through a jumper Environmental block to any of the four STD Bus interrupt signals Operating Temperature: on the backplane. LPM-OPTO48: -40° to +85° Celsius MCM-OPTO48: 0 to +65° Celsius I/O Connectors - The digital inputs lines are dif- Non-condensing relative humidity: 5% to 95% ferential with each pair wired to one of the two 50-pin connectors. Channels 0 to 23 are on J1 and ORDERING INFORMATION Channels 24 - 47 are on J2. LPM-OPTO48 CMOS STD Bus 48-line opto-isolated SPECIFICATIONS input card with interrupts MCM-OPTO48 STD Bus 48-line opto-isolated input Electrical card with interrupt support STD Bus: MCM-OPTO48 CMOS STD Bus: LPM-OPTO48 Input isolation voltage = 1500 volts Vcc = +5V @ 120mA typical (MCM-OPTO48) +5V @ 12mA typical (LPM-OPTO48) 715 Stadium Drive • Arlington, Texas 76011 • (817) 274-7553 • http://www.winsystems.com