48 ER3000 User Manual
9.10 Analog and Digital Output Variables
88 ID_DIGITAL_OUTPUT1 - This variable can be written directly by a
program or by the embedded profile using the Digital Output command.
This variable is written to Digital Output #1, shown in Table 2,
Auxiliary Cable Assembly.
89 ID_DIGITAL_OUTPUT2 - This variable can be written directly by a
program, by the embedded profile using the Digital Output command,
or by the embedded code. The embedded code updates this output if
variable ID_TTL_FLAG enables this output as a within tolerance
indicator. If enabled, ID_TTL_ERR0 and ID_TTL_ERR4095 variables
are used to set the maximum error allowed, in counts, for a setpoint of 0
and 4095 counts, respectively. The embedded code interpolates
between these points to find the maximum error allowed for all other
setpoint values. Reference ID_SETPOINT and ID_FEEDBACK to
translate between counts and percent. This variable is written to Digital
Output #2, shown in Table 2, Auxiliary Cable Assembly.
90 ID_DIGITAL_OUT1_INIT - Power-up state of ID_DIGITAL_OUT1.
91 ID_DIGITAL_OUT2_INIT - Power-up state of ID_DIGITAL_OUT2.
92 ID_DA_ANALOG_OUT - This is the value written to the D/A
converter to generate the 0-10V or 4-20mA output signal.
93 ID_TTL_ERR0 - Maximum error allowed at 0 counts, see variable 89.
94 ID_TTL_ERR4095 - Maximum error allowed at 4095 counts, see
variable 89.
96 ID_TTL_FLAG - This variable enables(1) or disables(0) the usage of
ID_DIGITAL_OUTPUT2 as a within tolerance indicator.
9.11 PWM Control Variables
12 ID_PWM_SHUTOFF_FLAG – This flag is only active if
ID_RTTASK_DELAY (variable #13) is not a 0 or 1 and designates
what the ER3000 will send to the PWM every 25ms while it is
delaying.
0 => Write the previously computed value to the PWM
1 => Write a 0 to the PWM.
13 ID_RTTASK_DELAY – This variable is set to 0 typically, allowing the
control algorithm to generate a new value for the PWM every 25ms.
Certain systems need a slower acting control system which is allowed
by with this variable, for example writing a 4 to this variable will allow
the control algorithm to compute a new PWM value every 100ms.
19 ID_INNER_SENSOR_MIN – This variable operation is typically
disabled by writing a 0 to it. If not disabled, it allows for a minimum
internal pressure. If the internal pressure is below the specified value
the exhaust valve will not be opened to decrease the pressure.
20 ID_INNER_SENSOR_MAX – This variable operation is typically
disabled by writing a 4095 to it. If not disabled, it allows for a
maximum internal pressure. If the internal pressure is above the
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