dcs

The 1756-IB16S Safety Input Card: Dual Channel, Test Pulses and What OSSD Means

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A dual-channel gate switch wired to a 1756-IB16S with TO-0 to IN-0 and TO-1 to IN-1, the rest of the terminals shown, and the point mode, pulse and delay rules printed underneath

The 1756-IB16S Safety Input Card: Dual Channel, Test Pulses and What OSSD Means Channels 0 and 8 look like the obvious pair for a dual-channel gate switch on a 1756-IB16S. They are directly opposite each other on the terminal block and the wiring is tidy. They are also the one pair the module will not … Read more

THRSe, TSAM and FSBM: The Four Sensors and the Sequence That Has to Hold

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A conveyor in plan with a light curtain in the middle and four muting sensors, S1 and S2 before it and S3 and S4 after it, each labelled with its position in the forward and reverse sequences, and the four timer windows S1-S2, S2-LC, LC-S3 and S3-S4 drawn as spans between them, with the note that each timer is 5 to 180,000 ms or 0 to switch that check off, the Maximum Mute Time is 0 to 3600 s and the Maximum Override Time is 0 to 30 s with a hold-to-run device

THRSe, TSAM and FSBM: The Four Sensors and the Sequence That Has to Hold An FSBM instruction sitting at Fault Code 16#9121 has already told you where to look, and it is not a sensor alignment problem yet. The third digit of that code is the step number: the instruction was in step 2 of … Read more

DCS and the Dual-Channel Family: Discrepancy Time, and the Two Faults With No Timer Behind Them

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A four-column table of the dual-channel instructions with what each is for, its discrepancy range and what it adds: DCS for a stop device at 5 to 3000 ms adding Restart Type and Cold Start Type; DCST the same plus a forced test; DCSTL the same plus a lock request and lock feedback; DCSTM the same plus muting; DCM for monitoring a cam or limit switch at 0 to 3000 ms, adding an Equivalent-Active Low input type and a zero that disables the check; DCSRT for a start device such as an enable pendant, with an Enable input and a window measured on the way in; and THRSe with a 100 to 3000 ms range that means something different again

DCS and the Dual-Channel Family: Discrepancy Time, and the Two Faults With No Timer Behind Them A DCS instruction reporting Fault Code 16#4002 has not had a discrepancy in the sense anybody means by the word. That code means Channel A went to the safe state and came back to the active state while Channel … Read more

ESTOP and Its Two Reset Inputs: What a Safety Reset Actually Requires

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The ESTOP instruction drawn as a panel of operands and values: Reset Type Manual with the note that Automatic energises Output 1 after 50 ms, Channel A on IN0 and Channel B on IN1 both normally open with safe equal to zero, Circuit Reset on IN2 where a zero to one transition energises Output 1, Fault Reset on IN3 where a zero to one transition clears Inputs Inconsistent, an Inconsistent Time Period of 500 ms marked fixed with no operand for it, and the outputs Output 1, Cycle Inputs, Circuit Reset Held On, Inputs Inconsistent and Fault Present with what each one means

ESTOP and Its Two Reset Inputs: What a Safety Reset Actually Requires An ESTOP instruction on a GuardLogix 5580 sitting with Fault Present on and Inputs Inconsistent on will ignore the blue button on the panel for as long as that button is wired to the Circuit Reset operand. Circuit Reset energises Output 1, Fault … Read more

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