H8GN-AD DC24 Omron, H8GN-AD DC24 Datasheet - Page 8

• Manufacturer Part Number: H8GN-AD DC24
• Description: TIMER/COUNTER 1/32DIN 24VDC
• Manufacturer: Omron
• Series: H8GNr

Specifications of H8GN-AD DC24

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: H8GN-ADDC24; H8GNADDC24

Power Supplies
When turning the power ON and OFF, input signal reception is possi-
ble, unstable, or impossible as shown in the diagram below.
Turn the power ON and OFF using a relay with a rated capacity of
15 A minimum to prevent contact deterioration due to inrush current
caused by turning the power ON and OFF.
When power is turned ON, a starting current flows momentarily.
Therefore, pay attention to the overcurrent detection level of the
power supply used.
Timer Control with Power Start
To allow for the startup time of peripheral devices (sensors, etc.), the
H8GN starts timing operation between 210 to 260 ms after power is
turned ON (see diagram above). For this reason, in operations where
timing starts from power ON, the time display will actually start from
258 ms. If the set value is 258 ms or less, the time until output turns
ON will be a fixed value between 210 and 260. (Normal operation is
possible for set value of 259 ms or more.) In applications where a set
value of 258 ms or less is required, use start timing with signal input.
When the H8GN is used with power start in F mode (i.e., accumula-
tive operation with output on hold), there will be a timer error (approx-
imately 100 ms each time the H8GN is turned ON) due to the
characteristics of the internal circuitry. Use the H8GN with signal
start if timer accuracy is required.
Using the Prescale Function
The count will become incorrect if the prescale value is not set
correctly. Check the setting to be sure it is correct.
Changing the Set Value
In Counter Operation
When changing the set value during operation, the output will turn
ON if the set value equals the present value.
In Timer Operation
When changing the set value during operation, if the set value is
changed in so that the conditions below are satisfied, the Timer oper-
ates in the same way as when the present value reaches the set
value because a constant read-in system is in use. Depending on the
output mode, this may result in output turning ON.
Timer mode UP:
Timer mode DOWN:Elapsed time ≥ set value
Note: When in DOWN mode, the amount set value is changed is add-
Operation with a Set value of 0
In Counter Operation
The output will turn ON if the set value (0) equals the present value.
The output will be OFF while the Reset Key is pressed or the reset
input is ON.
In Timer Operation
a) When the output mode is set to A, B (one-shot output), D, or F,
output will turn ON when the start signal is input.
b) When the output mode is set to B (hold output), E, or Z, output will
remain OFF even when the start signal is input.
Power
supply
ed to or subtracted from the present value.
Input
ON
OFF
Impossible
Present value ≥ set value
(Present value = 0)
210 ms
Unstable
0 to 50 ms
Possible
5 ms
0 to 500 ms
Unstable
Impossible
Response Delay Time When Resetting
The following table shows the delay from when the reset signal is
input until the output is turned OFF.
Output Delay Time
The following table shows the delay from when the timer value
passes the set value until the output is produced.
Actual Measurements in N or K Mode
*The variation in delays is due to different modes and conditions.
Mounting
Tighten the two mounting screws on the Adaptor. Tighten them alter-
nately, a little at a time, so as to keep them at an equal tightness.
The H8GN’s panel surface is water-resistive (conforming to NEMA
4X (indoors) and IP66). In order to prevent the internal circuit from
water penetration through the space between the Counter and oper-
ating panel, attach a rubber packing (provided with the H8GN)
between the Counter and operating panel and secure the rubber
packing with the Flush-mounting Adaptor.
Output
The SPDT (single-pole, double-throw) consists of an SPST-NO con-
tact and an SPST-NC contact. Do not form a circuit with 3-point
short-circuit (power short-circuiting with arc).
Reference
For details about communications functions, refer to H8GN Preset
Counter/Timer User’s Manual (Cat. No. M066).
1 ms
20 ms
Contact output
Minimum reset signal width
Control output
Power supply
30 Hz
5 kHz
Short-circuit current
Max. counting
speed
3.7 to 6.0 ms
19 to 21 ms
Adaptor
Output delay time
Waterproof packing
17.3 to 18.9 ms
3.5 to 5.2 ms
Output delay time*
Panel
H8GN
8