6.4. Status Bar Information

6.4. Status Bar Information

 

(1)   A shown in [Figure6.18], the Status Bar located at the bottom of HRLadder partially provides the information of the operating condition f the embedded PLC. (This information is only displayed when the embedded PLC is in RUN or remote RUN condition.) The meaning is described in Table 6-3.

 

Figure 6.18 Embedded PLC Operating Condition Information on Status Bar

 

Table 6‑4 Meaning of Embedded PLC Operating Condition Information on Status Bar

mon.time (monitoring time)	Frequency of relay value monitoring
scan time	Operating repeat frequency of entire ladder task Current value, maximum value, average value
occu (occupation)	Ratio within frequency unit
n steps	Number of steps (instructions) of entire ladder task

 

(2)   The frequency unit of the Hi5 Controller is 5ms. If the frequency exceeds 5ms, the scan time will increase by 5ms as shown in [Table 6-5]. Roughly about 1,700 steps would exceed the 20ms. (Based on Hi5 main board S/W version 30.11-00)

 

Table 6‑5 Relationship Between Ladder Processing Time and Processing Frequency

(Ladder processing time) < 5ms	Repeatedly execute the ladder task every 5ms.
5ms < (Ladder processing time) < 10ms	Repeatedly execute the ladder task every 10ms.
10ms < (Ladder processing time) < 15ms	Repeatedly execute the ladder task every 15ms.
….	……

 

(3)   When the ladder task takes the long time and exceeds the set scan time, some PLCs will not execute the instruction of exceeded time and ignore that operation. This is called the Fixed Scan Time Method.

 

(4)   Embedded PLC uses the Variable Scan Time Method. Therefore when the ladder task exceeds the preset scan time, the scan time will be increased by 5ms.

 

(5)   [Figure6.19] shows the concept of occu. and is an example of when the required time of the ladder task exceeds the 5ms. Therefore the scan time becomes 10ms. Based on the 40% value of occu. you can see that there is still some room to reach scan time of 15ms.

 

←    scan time = 10ms (cycle n-1)    →			←     scan time = 10ms (cycle n)     →
←     5ms    →	←     5ms    →		←     5ms    →	←     5ms    →
100%	40%		100%	40%
	occu.			occu.

Figure 6.19 Example of occu. Concept