diff --git a/python/set_devices/ump_logger.py b/python/set_devices/ump_logger.py
index 1ecb4f1..01004d7 100644
--- a/python/set_devices/ump_logger.py
+++ b/python/set_devices/ump_logger.py
@@ -68,17 +68,20 @@ FIELDS = (
 )
 
 
-def request(controller: int, function: int, address: int, value: int) -> bytes:
+def request(controller: int, function: int, address: int, value: int, *, record_words: int = WORDS) -> bytes:
     if not 0 <= controller <= 255 or not 0 <= value <= 65535:
         raise ValueError('Недопустимый адрес контроллера или значение')
+    if record_words not in (40, 42):
+        raise ValueError('Неверный размер записи логгера')
+    capacity = {40: 800, 42: 760}[record_words]
     if function == 3:
         valid = ((address == BASE and value == 16) or
                  (address == DATA and 1 <= value <= 120 and (value % WORDS == 0 or value in (42, 84))) or (address == LIVE and value == 124) or (address == EMU_CONTROL and value == 4)
                  or (address == FAST_CAPABILITY and value == 4)
-                 or (FAST_DATA <= address < FAST_DATA + CAPACITY * WORDS
-                     and (address - FAST_DATA) % WORDS == 0
-                     and 1 <= value <= 120 and value % WORDS == 0
-                     and address + value <= FAST_DATA + CAPACITY * WORDS))
+                 or (FAST_DATA <= address < FAST_DATA + capacity * record_words
+                     and (address - FAST_DATA) % record_words == 0
+                     and 1 <= value <= 120 and value % record_words == 0
+                     and address + value <= FAST_DATA + capacity * record_words))
     else:
         valid = function == 6 and (address in (BASE, BASE + 1, BASE + 2, BASE + 3) or
                                    (address == EMU_CONTROL + 2 and value in (0, 1)))