Weidmuller WI-I/O-EX: Wireless I/O Expansion Modules v1.11 - Manual (Page 7)

WI-I/O-EX Serial I/O Module User Manual v1.11
WI-IO-EX Manual v1.11 Page 7
to reach the Target within the update time. The output pulse rate is determined by
the update time, and the difference between the count and the target.
If the calculated pulse rate is more than the maximum rate (100Hz), the WI-I/O-EX will
output pulses at the maximum rate. At the end of the update time, the count value will be
less than the target. The WI-I/O-EX will then calculate the new required pulse rate for
the next update period, based on the difference between Count and Target values.
If the calculated pulse rate is greater than around three times the maximum rate, pulses
are not output. The Count value will be set to the value of the Target without any pulses
output. Pulses will be output again when the calculated pulse rate falls within the
maximum possible rate.
1.1.3 Pulsed inputs
The first four digital channels on the WI-I/O-EX-1-S-11 module can be used as pulsed
inputs. The maximum input pulse frequency is 1 KHz.
The pulse input channel calculates two register variables, each of which can be read by
the master.
• The Pulse Count is a count of the pulses detected on the channel since the WI-I/O-
EX powered up. The pulse input counts are 32-bit values (2 x 16-bit registers, a low
and a high register), and wrap around to zero on overflow.
• The Pulse Rate is a measure of the rate of pulses detected on the channel. The pulse
rate value is decimal 16,384 (hex 4000) for zero rate and decimal 49,152 (hex C000)
for the maximum rate configured by the user. These zero and maximum values are
the same as 0% and 100% used for analog values. (See section 5.4 for hex to decimal
conversion.)
The maximum pulse input rate is set during configuration. The value is in pulses per
minute and is limited to 60000 (1 KHz), the maximum rate capable of the module.
1.1.4 Analog inputs
The analog inputs on the WI-I/O-EX-1-S-12 can be connected as either grounded single-
ended inputs or as floating differential inputs. The WI-I/O-EX-1-S-12 has eight
grounded inputs or four floating inputs.
• Grounded single-ended inputs connect between the AIN terminal and the GND
terminal.
• Floating differential inputs each take up two terminals. There are four differential
pairs on the WI-I/O-EX-1-S-12: [AIN1-AIN2], [AIN3-AIN4], [AIN5-AIN6], [AIN7-
AIN8]. For example, the first input is connected to terminals AIN1 (positive) and
AIN2 (negative).