diff --git a/phys2bids/cli/run.py b/phys2bids/cli/run.py
index b1a3dec14..55f007f1d 100644
--- a/phys2bids/cli/run.py
+++ b/phys2bids/cli/run.py
@@ -164,6 +164,14 @@ def _get_parser():
         help="Column header (for json file output).",
         default=[],
     )
+    optional.add_argument(
+        "-ddir",
+        "--dicomdir",
+        dest="dicomdir",
+        type=str,
+        help="full path to MRI dicom folder corresponding to physiological data. Use this in conjunction with SIEMENS log files ONLY",
+        default="",
+    )
     optional.add_argument(
         "-yml",
         "--participant-yml",
diff --git a/phys2bids/io.py b/phys2bids/io.py
index d4a5e3903..730886c4e 100644
--- a/phys2bids/io.py
+++ b/phys2bids/io.py
@@ -1,11 +1,13 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """phys2bids interfaces for loading extension files."""
-
 import logging
+import os
 import warnings
 from copy import deepcopy
+from glob import glob
 from itertools import groupby
+from pathlib import Path
 
 import numpy as np
 
@@ -485,10 +487,6 @@ def load_gep(filename):
     --------
     physio_obj.BlueprintInput
     """
-    import os
-    from glob import glob
-    from pathlib import Path
-
     # Initiate lists of column names and units with time and trigger
     names = ["time", "trigger"]
     units = ["s", "mV"]  # Assuming recording units are mV...
@@ -510,7 +508,7 @@ def load_gep(filename):
     # Calculate time in seconds for first input (starts from -30s)
     interval = 1 / freq[0]
     duration = data[0].shape[0] * interval
-    t_ch = np.ogrid[-30 : duration - 30 : interval]
+    time_ch = np.ogrid[-30 : duration - 30 : interval]
 
     # Find and add additional data files
     filename = Path(filename)
@@ -535,11 +533,234 @@ def load_gep(filename):
     trigger = np.hstack((np.zeros(int(30 / interval)), np.ones(int((duration - 30) / interval))))
 
     # Create final list of timeseries
-    timeseries = [t_ch, trigger]
+    timeseries = [time_ch, trigger]
     timeseries.extend(data)
     return BlueprintInput(timeseries, freq, names, units, 1)
 
 
+def acqtime_to_seconds(acq_time_str):
+    """ """
+    hh = int(acq_time_str[0:2])
+    mm = int(acq_time_str[2:4])
+    ss = int(acq_time_str[4:6])
+    frac = float("0." + acq_time_str.split(".")[1]) if "." in acq_time_str else 0
+    return hh * 3600 + mm * 60 + ss + frac
+
+
+def physiologtime_to_seconds(pulse_time):
+    """ """
+    hh = pulse_time.hour
+    mm = pulse_time.minute
+    ss = pulse_time.second
+    frac = pulse_time.microsecond / 1000000
+    return hh * 3600 + mm * 60 + ss + frac
+
+
+def read_siemens_channel(
+    filename, channel_type, names, units, timeseries, freq, starttime, stoptime
+):
+    """ """
+    import fmri_physio_log as fpl
+
+    data = fpl.PhysioLog.from_filename(filename)
+
+    if np.all(data.ts != 0):
+
+        if channel_type == "ECG":
+            freq_mod = round(
+                len(data.ts[::4])
+                / (
+                    (
+                        physiologtime_to_seconds(data.mdh.stop_time)
+                        - physiologtime_to_seconds(data.mdh.start_time)
+                    )
+                    * data.rate
+                )
+            )
+            if freq_mod != 1:
+                LGR.warning(
+                    f"Incoherency found between logged time and frequency by a factor of {freq_mod}. Please check frequency time."
+                )
+
+            frequency = data.freq * freq_mod
+            start = physiologtime_to_seconds(data.mdh.start_time)
+            stop = start + len(data.ts - 1) * frequency
+            for i in range(4):
+                names.append(f"{channel_type}{i+1}")
+                units.append("")
+                timeseries.append(data.ts[i::4])
+                freq.append(data.rate * freq_mod)
+                starttime.append(physiologtime_to_seconds(data.mdh.start_time))
+                stoptime.append(stop)
+
+        else:
+            freq_mod = round(
+                len(data.ts[::4])
+                / (
+                    (
+                        physiologtime_to_seconds(data.mdh.stop_time)
+                        - physiologtime_to_seconds(data.mdh.start_time)
+                    )
+                    * data.rate
+                )
+            )
+            if freq_mod != 1:
+                LGR.warning(
+                    f"Incoherency found between logged time and frequency by a factor of {freq_mod}. Please check frequency time."
+                )
+
+            frequency = data.freq * freq_mod
+            start = physiologtime_to_seconds(data.mdh.start_time)
+            stop = start + len(data.ts - 1) * frequency
+            names.append(channel_type)
+            units.append("")
+            timeseries.append(data.ts)
+            freq.append(data.rate * freq_mod)
+            starttime.append(physiologtime_to_seconds(data.mdh.start_time))
+            stoptime.append(stop)
+
+        return names, units, timeseries, freq, starttime, stoptime, data
+
+
+def load_siemens(filename, dicomfolder=None):
+    """
+    Populate object phys_input from SIEMENS physiological files.
+
+    Uses the filename that the user provides to find any matching inputs
+    from other recording types (.puls, .resp, or .ecg).
+
+    Populates physio_obj with all identified recording types.
+    Takes into account possible differences in start and stop times across channels.
+    Uses DICOM metadata to find scan start and stop times and create trigger channel.
+    The modalities are in the order of 'names' entered by the user (after time and trigger).
+
+    Parameters
+    ----------
+    filename: str
+        path to the SIEMENS scanner physiological file
+    dicomfolder: str or None
+        path to the folder containing the DICOM files
+
+    Returns
+    -------
+    BlueprintInput
+
+    Note
+    ----
+
+    SIEMENS physiological files do not record a trigger so a column is added at
+    position 1. This has a value of zero up to the scan start time and then
+    a value of one for the duration of the scan.
+
+    See Also
+    --------
+    physio_obj.BlueprintInput
+    """
+    import pydicom
+
+    # initialise lists of metadata and data
+    names = []
+    units = []
+    freq = []
+    timeseries = []
+    starttime = []
+    stoptime = []
+
+    # Find and add additional data files
+    filename = Path(filename)
+    fnames = sorted(glob(os.path.join(filename.parent, f"*{filename.name}.*")))
+    if not len(fnames) == 0:
+        for fname in fnames:
+            if fname.endswith(".ecg"):
+                names, units, timeseries, freq, starttime, stoptime, data = read_siemens_channel(
+                    fname, "ECG", names, units, timeseries, freq, starttime, stoptime
+                )
+
+            elif fname.endswith(".ext"):
+                names, units, timeseries, freq, starttime, stoptime, data = read_siemens_channel(
+                    fname, "EXT", names, units, timeseries, freq, starttime, stoptime
+                )
+
+            elif fname.endswith(".ext2"):
+                names, units, timeseries, freq, starttime, stoptime, data = read_siemens_channel(
+                    fname, "EXT2", names, units, timeseries, freq, starttime, stoptime
+                )
+
+            elif fname.endswith(".puls"):
+                names, units, timeseries, freq, starttime, stoptime, data = read_siemens_channel(
+                    fname, "PPG", names, units, timeseries, freq, starttime, stoptime
+                )
+
+            elif fname.endswith(".resp"):
+                names, units, timeseries, freq, starttime, stoptime, data = read_siemens_channel(
+                    fname, "respiratory", names, units, timeseries, freq, starttime, stoptime
+                )
+
+    checkstartlen = np.unique(starttime)
+    checkstoplen = np.unique(stoptime)
+    checkfreqlen = np.unique(freq)
+
+    time_ch = np.ogrid[checkstartlen[0] : checkstoplen[-1] : 1 / checkfreqlen[-1] * 1000]
+    if checkstartlen.size > 1 or checkstoplen.size > 1:
+        for n, t in enumerate(timeseries):
+            time = np.ogrid[checkstartlen[0] : checkstoplen[-1] : 1 / freq[n] * 1000]
+            timeseries[n] = np.ones_like(time) * np.nan
+            phys_start = int(np.argmax(np.isclose(time, starttime[n])))
+            phys_stop = phys_start + len(t)
+            timeseries[n][phys_start:phys_stop] = t
+
+    # Calculate time in seconds
+    time_ch = time_ch / 1000
+
+    # Read the dicom to find start time, if it's given, otherwise assume it's
+    trigger = np.zeros_like(time_ch)
+
+    try:
+        trigger_samples = np.asarray(data.trigger_times, dtype=int)
+        valid = trigger_samples[(trigger_samples >= 0) & (trigger_samples < trigger.size)]
+        trigger[valid] = 1.0
+        LGR.info(f"Found {len(valid)} trigger events in log file.")
+    except AttributeError:
+        LGR.warning("Log file trigger events not found — attempting opening DICOM instead.")
+
+        if dicomfolder is not None:
+            files = sorted(
+                [
+                    os.path.join(dicomfolder, f)
+                    for f in os.listdir(dicomfolder)
+                    if os.path.isfile(os.path.join(dicomfolder, f))
+                ]
+            )
+            first_dcm = pydicom.dcmread(files[0], stop_before_pixels=True)
+            last_dcm = pydicom.dcmread(files[-1], stop_before_pixels=True)
+
+            epi_start = acqtime_to_seconds(first_dcm.AcquisitionTime) - data.mdh.start_time / 1000
+            epi_stop = (
+                acqtime_to_seconds(last_dcm.AcquisitionTime)
+                - data.mdh.start_time / 1000
+                + float(last_dcm.get("RepetitionTime", 0)) / 1000
+            )
+
+            # epi_stop needs to be incremented by TR in seconds
+
+            take_start = int(np.argmax(np.isclose(time_ch, epi_start)))
+            take_end = int(np.argmax(np.isclose(time_ch, epi_stop)))
+
+            trigger[take_start:take_end] = 1
+        else:
+            LGR.warning(
+                "DICOM folder not provided. Setting start_time to 0 (although "
+                "it might be wrong)."
+            )
+
+    # Initiate lists of column names and units with time and trigger
+    names = ["time", "trigger"] + names
+    units = ["s", ""] + units
+    freq = [checkfreqlen[-1], checkfreqlen[-1]] + freq
+
+    return BlueprintInput(timeseries, freq, names, units, 1)
+
+
 def load_smr(filename, chtrig=0):
     """Load Spike2 smr file and populate object phys_input.
 
diff --git a/phys2bids/phys2bids.py b/phys2bids/phys2bids.py
index 5161792bf..ed9ae99ae 100644
--- a/phys2bids/phys2bids.py
+++ b/phys2bids/phys2bids.py
@@ -144,6 +144,7 @@ def phys2bids(
     thr=None,
     pad=9,
     ch_name=[],
+    dicomdir=None,
     yml="",
     debug=False,
     quiet=False,
@@ -260,6 +261,10 @@ def phys2bids(
         from phys2bids.io import load_gep
 
         phys_in = load_gep(infile)
+    elif ftype in ["puls", "resp", "ecg", "ext", "ext2"]:
+        from phys2bids.io import load_siemens
+
+        phys_in = load_siemens(infile, dicomdir)
 
     LGR.info("Checking that units of measure are BIDS compatible")
     for index, unit in enumerate(phys_in.units):
@@ -515,6 +520,10 @@ def phys2bids(
                     phys_out[key].filename = f"{phys_out[key].filename}_{uniq_freq:.0f}Hz"
 
             LGR.info(f"Exporting files for take {take} freq {uniq_freq}")
+            # Check if timeseries has NaNs and save them as n/a
+            phys_out[key].timeseries = phys_out[key].timeseries.astype(object)
+            phys_out[key].timeseries[np.isnan(phys_out[key].timeseries)] = "n/a"
+
             np.savetxt(
                 phys_out[key].filename + ".tsv.gz",
                 phys_out[key].timeseries,
diff --git a/phys2bids/tests/conftest.py b/phys2bids/tests/conftest.py
index 0c43e6dde..92c0ff8c5 100644
--- a/phys2bids/tests/conftest.py
+++ b/phys2bids/tests/conftest.py
@@ -116,13 +116,13 @@ def ge_one_gep_file(testpath):
 
 @pytest.fixture
 def ge_two_gep_files_ppg(testpath):
-    tmp = fetch_file("qawjv", testpath, "RESPData_epiRT_0000000000_00_00_000.gep")
+    _ = fetch_file("qawjv", testpath, "RESPData_epiRT_0000000000_00_00_000.gep")
     return fetch_file("wb84d", testpath, "PPGData_epiRT_0000000000_00_00_000.gep")
 
 
 @pytest.fixture
 def ge_two_gep_files_resp(testpath):
-    tmp = fetch_file("wb84d", testpath, "PPGData_epiRT_0000000000_00_00_000.gep")
+    _ = fetch_file("wb84d", testpath, "PPGData_epiRT_0000000000_00_00_000.gep")
     return fetch_file("qawjv", testpath, "RESPData_epiRT_0000000000_00_00_000.gep")
 
 
@@ -133,17 +133,26 @@ def ge_one_raw_file(testpath):
 
 @pytest.fixture
 def ge_two_raw_files(testpath):
-    tmp = fetch_file("49xpw", testpath, "RESPData_epiRT_0000000000_00_00_000")
+    _ = fetch_file("49xpw", testpath, "RESPData_epiRT_0000000000_00_00_000")
     return fetch_file("u9wsr", testpath, "PPGData_epiRT_0000000000_00_00_000")
 
 
 @pytest.fixture
 def ge_badfiles(testpath):
-    tmp = fetch_file("tdmyn", testpath, "PPGData_epiRT_columnscsv_00_00_000")
-    tmp = fetch_file("b6skq", testpath, "PPGData_epiRT_columnstsv_00_00_000")
+    _ = fetch_file("tdmyn", testpath, "PPGData_epiRT_columnscsv_00_00_000")
+    _ = fetch_file("b6skq", testpath, "PPGData_epiRT_columnstsv_00_00_000")
     return fetch_file("8235b", testpath, "PPGData_epiRT_string0000_00_00_000")
 
 
+@pytest.fixture
+def SIEMENS_files(testpath):
+    _ = fetch_file(" ", testpath, "275_pulse_part_1.puls")
+    _ = fetch_file(" ", testpath, "275_pulse_part_1.ecg")
+    _ = fetch_file(" ", testpath, "275_pulse_part_1.ext")
+    _ = fetch_file(" ", testpath, "275_pulse_part_1.ext2")
+    return fetch_file(" ", testpath, "275_resp_part_1.resp")
+
+
 @pytest.fixture
 def spike2_smrx_file(testpath):
     return fetch_file("7x5qw", testpath, "Test_ppg_pulse_spike2.smrx")
diff --git a/phys2bids/tests/test_io.py b/phys2bids/tests/test_io.py
index ffed64546..a3299bf9e 100644
--- a/phys2bids/tests/test_io.py
+++ b/phys2bids/tests/test_io.py
@@ -2,6 +2,7 @@
 import os
 import sys
 
+import fmri_physio_log as fpl
 import numpy as np
 import pytest
 from pytest import raises
@@ -217,6 +218,38 @@ def test_load_gep_two_files_resp(ge_two_gep_files_resp, testpath):
     assert np.array_equal(gep_data2, phys_obj.timeseries[3])
 
 
+def test_SIEMENS(SIEMENS_files, testpath):
+    # Load data
+    phys_obj = io.load_siemens(SIEMENS_files)
+
+    assert phys_obj.ch_name == [
+        "time",
+        "trigger",
+        "ECG1",
+        "ECG2",
+        "ECG3",
+        "ECG4",
+        "PPG",
+        "respiratory",
+    ]
+
+    # Check the channel data is as expected
+    siemens_ecg = fpl.PhysioLog.from_filename(os.path.join(testpath, "275_pulse_part_1.ecg"))
+    data_ecg1 = np.array(siemens_ecg.ts[::4])
+    data_ecg3 = np.array(siemens_ecg.ts[2::4])
+    siemens_resp = fpl.PhysioLog.from_filename(SIEMENS_files)
+    data_resp = np.array(siemens_resp.ts)
+    siemens_pulse = fpl.PhysioLog.from_filename(os.path.join(testpath, "275_pulse_part_1.puls"))
+    data_pulse = np.array(siemens_pulse.ts)
+    assert np.array_equal(data_ecg1, phys_obj.timeseries[2][~np.isnan(phys_obj.timeseries[2])])
+    assert np.array_equal(data_ecg3, phys_obj.timeseries[4][~np.isnan(phys_obj.timeseries[4])])
+    assert np.array_equal(data_pulse, phys_obj.timeseries[6][~np.isnan(phys_obj.timeseries[6])])
+    assert np.array_equal(data_resp, phys_obj.timeseries[7][~np.isnan(phys_obj.timeseries[7])])
+
+
+# check if data in phys_obj timeseries are padded, padding needs to be undone for the test to succeed
+
+
 @pytest.mark.skipif(
     sys.version_info < (3, 7) or sys.version_info > (3, 9),
     reason="Requires python between 3.7 and 3.9",
diff --git a/phys2bids/utils.py b/phys2bids/utils.py
index 05949afa9..0b38fa85d 100644
--- a/phys2bids/utils.py
+++ b/phys2bids/utils.py
@@ -9,7 +9,7 @@
 
 LGR = logging.getLogger(__name__)
 
-SUPPORTED_FTYPES = ("acq", "txt", "mat", "gep")
+SUPPORTED_FTYPES = ("acq", "txt", "mat", "gep", "puls", "resp", "ecg", "ext", "ext2")
 
 
 def check_input_ext(filename, ext):
diff --git a/setup.cfg b/setup.cfg
index 20204cd93..ccf1e0a02 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -49,6 +49,9 @@ doc =
     sphinx >=2.0
     sphinx-argparse
     sphinx_rtd_theme
+siemens =
+    fmri_physio_log
+    pydicom
 style =
     flake8 >=4.0
     black
@@ -126,6 +129,7 @@ skip = venvs,.venv,versioneer.py,.git,build,./docs/_build
 write-changes =
 count =
 quiet-level = 3
+ignore-words-list = puls
 
 [tool:pytest]
 doctest_optionflags = NORMALIZE_WHITESPACE