Chapter 7 High-speed Counter Module AH02HC/AH04HC 4. Bit 3 in CR4/CR32/CR60/CR88: If bit 3 in CR4/CR32/CR60/CR88 is turned ON, the alarm function is enabled. If bit 3 in CR4/CR32/CR60/CR88 is turned OFF, the alarm function is disabled. After the alarm function is enabled, bit 4 or bit 5 in CR19/CR47/CR75/CR103 will be turned ON if the number of pulses sampled in a cycle is larger than the upper-upper limit value set or less than the lower-lower limit value set. If the number of sampled pulses is between the upper-lower limit value set and the lower-upper limit value set, bit 4 or bit 5 in CR19/CR47/CR75/CR103 will be turned OFF.
If users want to use the alarm function, they have to set an upper-upper limit value, an upper-lower limit value, a lower-upper limit value, and a lower-lower limit value. The setting of the four limit values must comply with the rules listed below. (1) The four limit values must be in the range of -200000 to 200000. (2) Upper-upper limit value ≧ Upper-lower limit value ＞ Lower-upper limit value ≧ Lower-lower limit value If the setting of the four limit values does not comply with the rules listed above, and the alarm function is enabled, bit 6 in CR19/CR47/CR75/CR103 is turned ON when bit 0 in CR0/CR28/CR56/CR84 is turned from OFF to ON.
Users can read the error code 16#A0n5 in CR26/CR54/CR82/CR110. (n is a channel number. n: 0~3 (i.e. channel 0~channel 3)) The alarm flags are described below.
7-23 Item Setting value Parameter CH0 CH1 CH2 CH3 Upper-upper limit value (Low word) -200000~200000 #8 #36 #64 #92 Upper-upper limit value (High word) #9 #37 #65 #93 Upper-lower limit value (Low word) -200000~200000 #10 #38 #66 #94 Upper-lower limit value (High word) #11 #39 #67 #95 Lower-upper limit value (Low word) -200000~200000 #12 #40 #68 #96 Lower-upper limit value (High word) #13 #41 #69 #97 Lower-lower limit value (Low word) -200000~200000 #14 #42 #70 #98 Lower-lower limit value (High word) #15 #43 #71 #99 Item Value Parameter CH0 CH1 CH2 CH3 Operating state of a counter Bit 4: Exceeding the upper limit set Bit 5: Exceeding the lower limit set #19 #47 #75 #103