Can both control and manual control, auto/manual transfer switch should be added, in case of contradiction between automatic and manual control, and automatic/manual transfer switch, then you can completely from the PLC, relay direct control of solenoid valves achieve the purpose of manual
Category: plc program
PLC applications what are the main
1 for switch controlPLC control switching capability is strong. Under the control of the in and out points, more than 10 points less, dozens of points, many hundreds of, thousands of and even tens of thousands of points. Due to its network, virtually unlimited points, no matter how many points can control.The logical problems can … Continue reading PLC applications what are the main
PLC selection guide
First, input/output (I/O) point estimateI/O points should be considered when estimating the appropriate margins, usually according to the statistics of the input and output points, adding 10%~20% and ExtensibleAfter allowance, as input and output point estimates. Actual orders, according to manufacturer product features of the PLC, the input and output points are rounded.Second, the storage … Continue reading PLC selection guide
ANB parallel circuit connected between PLC
ANB (circuit) parallel circuits connected in series between the block directiveIntroductions:(1) front circuit in series with the parallel circuit blocks and ANB instructions. Parallel circuit block starting with the LD or LDI instruction.(2) If multiple parallel circuit blocks in sequence with ANB instructions front circuits connected in series, with no limit to the number of … Continue reading ANB parallel circuit connected between PLC
PLC series circuits connected in parallel (ORB) Instructions Example
ORB (circuit or) series circuits connected in parallel directivesIntroductions:(1) more than 2 contacts connected in series circuit series circuit. Series circuits connected in parallel connection, the branch started with LD and LDI instruction, the ends of the branches with the ORB directives.(2) the ORB directives ANB instruction is available with the latter operating units of … Continue reading PLC series circuits connected in parallel (ORB) Instructions Example
PLC-contact (OR/ORI) Instructions Use for example
OR (or) normally open contacts connected in parallel directivesORI (or not) normally closed contacts connected in parallel directivesIntroductions:(1) OR ORI is connected in parallel to a single point of contact and instructions, paralleling a plurality of contacts cannot be used with this directive(2) and ORI OR directive from which the current step, LD, LDI instruction … Continue reading PLC-contact (OR/ORI) Instructions Use for example
PLC input/output instructions (LD/LDI/OUT)
LD with the LDI instruction for contacts connected to the bus, in addition to starting point that can be used in the branch circuit.Coil is driven OUT instructions instructions, can be used to output relays, auxiliary relays, timers, counters, registers, and so on, but cannot be used to enter a relay. Output directive is used … Continue reading PLC input/output instructions (LD/LDI/OUT)
PLC-contact instructions (FNC224~FNC246)
Contact compare total 18(1) the LD contacts compare this kind of instruction mnemonics, code, and functionality.(2) compare AND contact the class instruction mnemonic, code(3) OR contact instructionsOR= instructions for use as shown in Figure 3-93, when X1 is ON, or the current value of the counter is 200, driving Y0.Contact compare any data format of … Continue reading PLC-contact instructions (FNC224~FNC246)
PLC gray code conversion and analog module special instructions
(1) gray code transform and inverse transform instructions these instructions 2: GRY (FNC170) and GBIN (FNC171), used for photoelectric encoder encoder disk data. (D) GRN (p) instruction function is to convert binary to gray code, (d) GBIN (p) instruction is the inverse transform of GRY. As shown in Figure 3-89, GRY command is the source … Continue reading PLC gray code conversion and analog module special instructions
PLC Clock operation Instructions (FNC160~FNC169)
Seven clock operation class instruction, Directive number distribution between FNC160~FNC169. Such instructions are on the clock clock operation operation and compare the data, PLC built-in real-time clock for time calibration and data formatting.(1) clock and data compare TCMP (FNC160) TCMP (p) function is used to compare the data in the specified time and clock size. … Continue reading PLC Clock operation Instructions (FNC160~FNC169)
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