plc program
PLS (Pulse): rising differential output directive.PLF: falling edge of differential output directive.PLS and PLF command can only be used for the output relays and auxiliary relays (does not include special auxiliary relays). M0 in the figure only in the X0 normally open from open to close (X0 rising edge) when a scan cycle for ON,M1 … Continue reading Mitsubishi PLC PLS sum PLF directive
Impulsive differential instruction can be used to test the rising and falling edge of the input pulse, when conditions are met, a narrow pulse signal output. PLS, PLF two instructions.1 PLS instructionsPLS order known as the rising edge of impulsive differential instruction. Its functions are: when a rising edge of the input pulse signal is … Continue reading PLC pulse differential instruction using examples
1 SET instructions SET command called reset instructions. Its function is to: driving coil, making it with locking function, maintain the on State. In Figure 1, when the movable contact X0 closed, SET instruction is executed, Y0 coil connected. After first X0, Y0 coils to keep the on State to Y0 coil power, you must use … Continue reading PLC set and reset commands usage
1. no operation (NOP)NOP: no operationNOP instruction is typically used for the following aspects: Specifies a certain sequence content is empty, blank for use; some short circuit the contacts or circuit, as shown in Figure 7.24 (a), (b) shown cut off some of the circuit, as shown in Figure 7.24 (c), (d) shown in transform … Continue reading PLC no operation (NOP), program end (END) command
You what kind of touch screen and PLC, because each brand of touch screen and PLC connector wiring and communication methods are not the same, you get their wiring diagrams and PLC downloading programs, touch-screen computers configured, when creating a new project, will let you choose what to connect plc, what type, and then select … Continue reading Link between touch screen and PLC
PLC is always in order from top to bottom in order to scan the user program (ladder diagram). When scanning a ladder diagram, always scan the ladder by the contact form on the left of the control circuit, after the first left and then right, and according to the sequence made up of contact points … Continue reading How the PLC ladder program execution
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 (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 ONE 