TAMAGAWA TS2651N181E78 TS2651N181E78 TS2651N181E78 TS2651N181E78 TS2651N181E78

TS2651N181E78

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igure below.)
The channel conversion time, including module communication time, is 84 ms. The module
must change to the second channel of the group using OptoMOS relays when conversion is
completed. Opto-MOS relays require 12 ms for switching and settling. Each channel requires
a time of 97 ms, i.e. the total cycle time equals 194 ms.
Cycle time = (tK + tU) x 2
Cycle time = (84 ms + 16 ms) x 2
Cycle time = 200 ms
tC: Conversion time for one channel
tC: Channel changeover time within the channel group
8-channel mode (software filter)
Analog-to-digital conversion in this mode is identical to the conversion in 8-channel mode
(hardware filter). The four ADCs of the module simultaneously convert channels 0, 2, 4 and
6. The ADCs first convert the channels with even numbers, and then the channels with the
odd numbers 1, 3, 5 and 7 (see the figure below.)
The channel conversion time is based on the programmed interference frequency. The
channel conversion time is 32 ms, including communication time, when you set an
interference frequency of 50 Hz. The channel conversion time is 27 ms when you set an
interference frequency of 60 Hz. You can reduce channel conversion times to 9 ms by
setting an interference frequency of 400 Hz. As in "hardware filter, 8channel" mode, the
module has to toggle to the second channel of the group within a changeover time of 16 ms
using the Opto-MOS relays. The table below shows this correlation.
Table 6- 26 Cycle times in "8-channel mode (software filter)"

The converted value settles to 100% within 80 ms and is updated at intervals of 10 ms when
4-channel mode is set. The channel and module cycle times are always identical, as the
module does not change between the channels of a group: 10 ms.
Channel conversion time = channel cycle time = module cycle time = 10 ms
The wire-break monitoring software function of the module is available in all operating
modes.
The cycle time of the module is doubled in 8-channel mode (hardware or software filter),
irrespective of the number of channels at which wire-break monitoring is enabled.
In 4-channel mode (hardware filter), the module interrupts processing of input data for the
duration of 100 ms and performs a line continuity check. That is, each line continuity check
extends the module cycle time by 100 ms.
Unused channels
In order to avoid incorrect measurements, an unused channel from an active group of
channels must be configured. Connect a resistor of the nominal range to the unused channel
in order to suppress diagnostics errors.Set the "disabled" value at the "measurement type" parameter for unused channels. This
setting reduces module cycle times.Short-circuit to M or LThe module does not suffer any damage if you short-circuit an input channel to M or L.. The
channel continues to output valid data and does not report a diagnostics event.End of cycle interrupt
You can synchronize a process with the conversion cycle of the module by enabling the end
of cycle interrupt. The interrupt is set when all active channels have been converted.The table below shows the contents of the 4 bytes of additional OB40 information duringprocess or end of cycle interrupts
Certain parameters are not allowed when operating the SM 331; AI 8 x RTD analog input
module on an ET 200M PROFIBUS slave system and the PROFIBUS master is not an S7master.. Non-S7 masters do not support process interrupts. All parameters associated with
these functions are disabled for this reason. This includes process interrupt enable,
hardware restrictions and end the enabling of cycle interrupts. All other parameters areallowed.6ES7331-7PF11-0AB0
Properties